the root watering system is disclosed herein with respect to exemplary embodiments . the embodiments are disclosed for illustration of the root watering system and are not limiting except as defined in the appended claims . fig1 and 2 illustrate an embodiment of a water sock 100 . the water sock comprises an outer cover 110 that is generally formed as an elongated tubular body 112 having a first end 114 ( referred to herein as the upper end ) and a second end 116 ( referred to herein as the lower end ). the outer cover comprises a sturdy filtration material that allows water to seep through the covering but which prevents soil , insects and other unwanted material from passing through the covering . for example , in the illustrated embodiment , the outer cover comprises a geotextile material such as mirafi ® 140n , which is commercially available from ten cate geosynthetics north america , 365 south holland drive , pendergrass , ga . 30567 . as described by the manufacturer , the geotextile material comprises high - tenacity monofilament polypropylene yarns that are woven into a stable network such that the yarns retain their relative positions . the geotextile is inert to biological degradation and resists naturally encountered chemicals , alkalis and acids . similar materials from the same manufacturer or from other manufacturers may also be used . as further shown in fig1 and 2 , in the illustrated embodiment , the tubular body 112 of the outer cover 110 is formed from a generally rectangular sheet 120 of the geotextile material with the long edges attached ( e . g ., by sewing ) along a longitudinal seam 122 to form a generally cylindrical shape . the upper end 114 comprises a generally circular sheet 124 ( shown in fig2 ) of the geotextile material having a diameter sufficiently larger than the diameter of the tubular body . the circular sheet is attached to the generally circular perimeter formed by a short edge of the geotextile material to close the tubular body along a circumferential seam 126 . in the illustrated embodiment , the seams are formed by stitching the geotextile material with polyester thread or a similar long lasting thread . preferably , the stitching or other attachment of the edges of the rectangular sheet and the attachment of the circular sheet to the circular perimeter are performed with the outer covering turned inside out . the outer covering is then inverted to the configuration shown in fig1 and 2 so that the two seams are on the inside . thus , the stitches or other attachment is protected from abrasion . in the illustrated embodiment , the lower end 116 of the outer covering is closed with a suitable crimping device 130 , such as , for example , a metallic band similar to the leg bands used to identify birds . alternatively , a plastic tie wrap or similar device can be used to close the lower end 116 to provide a tight seal . in fig2 , the tubular body 112 of the outer cover 110 of the water sock 100 is partially broken away to show a plurality of internal supporting structures 140 , which are enclosed within the outer cover . in the illustrated embodiment , the internal supporting structures comprise hollow spheres , which preferably comprise polypropylene or other suitable plastic material formed as a thin outer shell with a relatively large inner cavity . the thin outer shell of each sphere is perforated with a plurality of holes 142 so that the inner cavity of the sphere is exposed . in the illustrated embodiments , the perforated spherical shape of the internal supporting structures 140 is similar to the shape of conventional plastic training balls used in various sports . such training balls can be used for the supporting structures ; however , the aerodynamic characteristics of the internal supporting structures are not pertinent to the supporting function . accordingly , the sizes , shapes and number of holes 142 may be selected to reduce the volume of the plastic material and thereby reduce the weight of the supporting structures . preferably , the holes that perforate the spherical outer shell are distributed over the surface of the sphere so that the orientation of a supporting structure within the outer cover is not critical to the function of the water sock . in particular , a sufficient number of holes are included so that when the water sock is installed in the soil , as described below , at least one hole of each supporting structure is oriented generally downward regardless of the angular orientation of the supporting structure . thus , as the water sock delivers water to the root system of tree or shrub , the internal supporting structures trap very little water within their respective cavities . fig3 a , 3 b , 3 c and 3 d illustrate the steps of adding the internal supporting structures 140 to the water sock 100 of fig1 and sealing the completed water sock . in fig3 a - 3d , the water sock is oriented such that the outer cover 110 is inverted with the closed first ( upper ) end 114 shown at the bottom and the second ( lower ) end 116 shown at the top . in each of fig3 a - 3d , the tubular body 112 of the outer cover is partially broken away to show the cavity formed by the tubular body . fig3 a illustrates the water sock 100 after the material of the tubular body 112 and the disk 124 are sewn or otherwise attached to create the outer cover 110 with the closed first end 114 . in fig3 a , the second end 116 is open and is ready to receive the first internal supporting structure 140 . in fig3 b , three of the internal supporting structures have been inserted into the water sock and a fourth supporting structure is being added . in fig3 c the water sock is filled with the desired number ( e . g ., 8 ) of the supporting structures , and the outer cover proximate to the second end is scrunched ( e . g ., folded or pleated ) to reduce the cross - sectional area so that the crimping device 130 can be attached . as discussed above , one suitable crimping device is a generally circular metallic band such as a leg band used to identify a bird . such leg bands are available , for example , from l & amp ; m bird leg bands , inc ., of san bernardino , calif ., and are available in different sizes . as shown in fig3 c , the crimping device is a split band , which is initially open so that the scrunched second end of the outer cover can be easily inserted . in fig3 d , the crimping device is secured to the scrunched material close to the uppermost ( as viewed in fig3 a - 3d ) supporting structure by applying pressure to close the open ends of the crimping device . for example , the pressure to close the band is advantageously applied using a pliers ( not shown ) adapted to close the gap in the band . such pliers in sizes corresponding to the sizes of the leg bands are also available from l & amp ; m bird leg bands , inc . preferably , excess material extending past the crimping device is removed ( e . g ., by cutting ). in certain embodiments of the water sock 100 , prior to closing the second end 116 , a fertilizer tablet 200 ( shown in fig3 c and 3d and in fig2 ) is added to the interior along with the internal supporting structures 140 . in particular , the fertilizer tablet is a slow release tablet that dissolves slowly over an extended period ( e . g ., many months ) so that fertilizer is released into the soil proximate the root system of the plant when the water sock is installed as described below . the diameters of the supporting structures 140 and the diameter of the outer cover 110 are matched so that the supporting structures fit within the outer cover . for example , as shown in fig4 a , a first embodiment 150 of the water sock has internal supporting structures 152 with diameters similar to the diameter of a conventional softball ( e . g ., approximately 4 . 5 inches ). the outer cover has a slightly larger inner diameter to accommodate the internal supporting structures . in the illustrated embodiment , the tubular body 112 has a length slightly larger than approximately 36 inches to accommodate the accumulative diameters of 8 internal supporting structures . the length of the tubular body and the number of internal supporting structures can be adjusted to create a water sock having a longer length or shorter length as desired . as described below , the larger first embodiment is suitable for use with a transplanted tree having a root ball with a depth of 2 - 3 feet . the first embodiment of the water sock has an internal volume of approximately 570 cubic inches , which is reduced by the relatively small volume displaced by the non - perforated portions of the outer shells of the internal supporting structures . as shown in fig4 b , a second embodiment 160 of the water sock has internal supporting structures 162 with diameters similar to the diameter of a conventional baseball ( e . g ., approximately 2 . 75 inches ). the outer cover 110 has a slightly larger inner diameter to accommodate the internal supporting structures . in the illustrated embodiment , the tubular body 112 of the second embodiment has a length slightly larger than approximately 22 inches to accommodate the accumulative diameters of 8 internal supporting structures . the length of the tubular body and the number of internal supporting structures can be adjusted to create a water sock having a longer length or shorter length as desired . as described below , the mid - sized second embodiment is suitable for use with smaller transplanted trees and larger shrubs having root balls less than approximately 2 feet in depth . in particular , the second embodiment of the water sock has an internal volume of approximately 130 cubic inches , which is reduced by the relatively small volume displaced by the non - perforated portions of the outer shells of the internal supporting structures . as shown in fig4 c , a third embodiment 170 of the water sock has internal supporting structures 172 with diameters similar to the diameter of a conventional golf ball ( e . g ., approximately 1 . 68 inches ). the outer cover 110 has a slightly larger inner diameter to accommodate the internal supporting structures . in the illustrated embodiment , the tubular body 112 of the third embodiment has a length slightly larger than approximately 13 . 5 inches to accommodate the accumulative diameters of 8 internal supporting structures . the length of the tubular body and the number of internal supporting structures can be adjusted to create a water sock having a longer length or shorter length as desired . as described below , the small - sized third embodiment is suitable for use with small transplanted trees and shrubs having root balls approximately a foot in depth . in particular , the third embodiment of the water sock has an internal volume of approximately 30 cubic inches , which is reduced by the relatively small volume displaced by the non - perforated portions of the outer shells of the internal supporting structures . other sizes of water socks can be constructed using internal supporting structures with different diameters and supporting structures that have different shapes ; however , the foregoing sizes of spheres are particularly advantageous because of the commercial availability of the perforated spherical balls widely used in sporting activities . fig5 illustrates an embodiment of a kit 200 comprising a plurality ( e . g ., 3 in the illustrated embodiment ) of water socks 100 and an auger 210 for creating holes to enable the water socks to be inserted in the ground proximate a shrub or tree . the auger has a shaft 212 coupled to a helical cutting member 214 that is sized to create a bore hole in the soil that is slightly larger than a water sock . the water socks in the kit are sized in accordance with one of the embodiments described in fig4 a , fig4 b or fig4 c , respectively . for example , for a kit comprising the smaller water sock 170 of fig4 c having the golf ball sized internal supporting structures , the helical cutting member has a diameter of approximately 1 . 75 inches to 2 inches . the mid - sized water sock 160 of fig4 b can be positioned in a bore hole created by an auger having a cutting member with a diameter of approximately 3 inches . the larger water sock 150 of fig4 a can be positioned in a bore hole created by an auger having a cutting member with a diameter of approximately 4 . 75 inches to 5 inches . as discussed below , the auger is advantageously driven by a power drill or other rotational source . fig6 a , 6 b and 6 c illustrate exemplary steps for installing the water socks 100 in the kit 200 of fig5 proximate to an existing shrub or small tree 250 . the existing shrub or small tree has a trunk 252 that supports foliage 254 . the shrub or small tree is anchored to the soil via a root system 256 . the auger 210 is coupled to a drill 260 or other source of rotating power and is positioned on the surface of the soil beneath the drip line of the tree or shrub as shown in fig6 a . the drill is operated to produce a generally vertical bore hole 270 that extends downward into the soil by a desired depth . for example , if only a single water sock 170 in accordance with the smallest embodiment is to be inserted , the depth of the bore is selected to be approximately 13 . 5 inches so that the when the second end 116 of the water sock is resting at the bottom of the bore hole , the first end 114 of the water sock is at the level of the original ground surface . the first end of the water sock may be slightly above or slightly below the ground surface and be effective for providing water to the root system of the tree or shrub . the bore hole may be extended or may be partially filled with soil to achieve the desired depth and resulting positioning of the first end of the water sock . if the root system 256 of the tree or shrub 250 is particularly deep , the bore hole 270 may be bored to a depth sufficient to accommodate two water socks 170 . the first water sock is inserted into the bore hole and the second water sock is positioned in the bore hole on top of the first water sock . after creating a sufficient number of bore holes 270 for the number of water socks 170 to be installed , the water socks are inserted into the bore holes with the first ( upper ) ends 114 proximate the surface of the ground as shown in fig6 b . if the water socks are loose in the bore holes , dirt may be added around the outsides of the water socks . as illustrated in fig6 c , after installing the water socks 170 , a small berm 280 is created around the tree or shrub 250 outside the drip line so that the bore holes 270 with the water socks are within the boundaries of the berm . the berm 280 forms a shallow pond around the base of the tree or shrub 250 . when the tree or shrub is irrigated , the water collects in the pond and filters into the interiors of the water socks 170 . thus , when a sufficient amount of water is applied to fill the pond , an additional volume of water is stored in the water socks within the bore holes . this accomplishes a dual purpose . the added volume of the water socks increases the amount of water that can be applied during an irrigation cycle . the water socks also serve as conduits to deliver water to the lower levels of the root system 256 of the tree or shrub instead of relying on the water applied to the ground surface to filter through the soil . thus , unlike conventional surface watering which may result in a shallow root system , the watering system utilizing the water socks causes the root system to develop at a greater depth , thus creating a stronger anchor for the tree or shrub and also causing the root system to be positioned to absorb water available at greater depths . the structure of the water sock 100 is particularly advantageous for deep watering of the roots . unlike pipes or other systems for applying water below the ground surface , which have exposed perforations that may clog up and become nonfunctional , the water sock has a continuous outer surface that allows the water to seep out of the interior of the water sock and into the surrounding soil . furthermore , the cylindrical structure of the geotextile outer cover 110 of the water sock is maintained by the internal supporting structures 140 , which prevent the water sock from collapsing from the pressure of the surrounding soil . the simple structure allows the water sock be manufactured easily and inexpensively from commercially available parts . the relatively thin shells of the internal support structures and the surrounding geotextile material allows the water sock to have a very light weight and yet be sufficiently rigid to allow the water sock to be easily inserted into a bore hole 270 . the water socks installed in the foregoing manner may include the slow - release fertilizer tablets 200 described above . fig7 a , 7 b and 7 c illustrate exemplary steps for installing the water socks when planting a new shrub or tree in an open hole . as illustrated in fig7 a , the root ball 300 of a tree or shrub 302 is positioned on a mound 310 of undisturbed original soil at the bottom of an excavated planting pit 312 in a conventional manner . as illustrated in fig7 b , a plurality of water socks 100 are positioned in the planting pit next to the root ball with the second ( lower ) ends 116 of the water socks positioned slightly below the lowest level of the root ball and with the first ( upper ) ends 114 of the water socks positioned proximate the original ground level surrounding the planting pit . the water socks are held in place while the planting pit is backfilled with soil as shown in fig7 c . as discussed above , a berm 320 is formed around the planting pit generally at the drip line of the tree or shrub . although installed in a different manner , the water socks installed in accordance with fig7 a - 7c provide the same deep watering benefits as described above with respect to fig6 a - 6c . the water socks installed in the foregoing manner may include the slow - release fertilizer tablets 200 described above . fig8 illustrates the planting of a new tree 400 on relatively level ground . the tree is planted in a planting pit 410 with the root ball 412 of the tree resting on a mound 414 at the bottom of the planting pit . a plurality of the water socks 100 ( preferably the larger water socks 150 of fig4 a ) are positioned in the planting pit at the outer boundary of the pit with the respective second ( lower ) ends 116 of the water socks extended below the level of the root ball . the respective first ( upper ) ends 114 of the water socks are positioned approximately at the surface of the ground surrounding the planting pit . after positioning the water socks , the planting pit is backfilled ( not shown ) and a berm 420 is created around the tree so that the tops of the water socks are within the surface encircled by the berm . the positions of the water socks 100 in the embodiment of fig8 is advantageous because at least a portion of the water is delivered to soil that is spaced apart from the root ball and that is at a lower depth than the root ball . accordingly , the root system of the new tree is encouraged to spread outwardly and downwardly to seek water . fig9 illustrates the installation of a new tree 500 on sloped ground . a planting pit 502 is formed in a portion of the ground that is leveled to accommodate the planting pit . the root ball 504 of the tree rests on a mound 506 in the planting pit . a plurality of water socks 100 are positioned around the outer boundary of the planting pit and the planting pit is backfilled ( not shown ). a berm 520 is formed around the planting pit . in certain installations of a new tree , the root ball may not be installed at a sufficient depth to accommodate the full length of a water sock . fig1 illustrates the installation of a plurality of water socks 100 proximate to the root ball 602 of a transplanted tree 600 with the water socks positioned on a mound 612 in a planting pit 610 at an angle ( e . g ., approximately 45 degrees ) with respect to perpendicular . the angled positions of the water socks provide the benefit of the full water storage and distribution capacity of the water sock while providing the water to the roots in the root ball from the surface down to the lowest level of the roots . the internal structure of the water sock allows the water sock to bend so that the water sock can form a downward spiral around the outer surface of the root ball or around the inner surface of the planting pit . as before , after installing the water socks and backfilling the planting pit , a berm 620 is created around the tree to encompass the tops of the water socks . the water socks installed in accordance with fig8 , fig9 or fig1 may include the slow - release fertilizer tablets 200 described above . the embodiments of the water sock described herein provide an economical , light weight , easy to install and long lasting system for providing water to the root systems of shrubs and trees . the materials used do not degrade significantly over many years of use . the water permeable geotextile material allows water to flow in and out of the water socks yet keeps soil , insects and other materials out of the water socks so that the water socks will remain free of debris and continue to transport water to the root systems for many years . as various changes could be made in the above constructions without departing from the scope of the invention , it is intended that all the matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense .
a root watering system for a tree or a shrub includes an outer container of a water - permeable , flexible material . a perforated , hollow inner support structure maintains the flexible material in an elongated shape between first and second ends . the outer container is positioned in the ground with the elongated shape proximate to the roots of the tree or shrub and with the first end proximate to the surface of the ground and with the second end near a lower end extending generally downward toward the lower portion of the root system of the tree or shrub . water applied to the ground proximate the upper end of the outer container enters the first end and fills the outer container including the hollow inner support structure . water within the outer container is released through the porous , flexible material to provide water to the root system of the tree or shrub .