method of manufacture of foam coated rod - like elements particularly for supporting pot - grown plants in general comprising the step of arranging a plurality of elongated tubular members of plastic material in spaced parallel relationship to each other into a tank and casting synthetic foam forming chemicals into the tank . the foam forming chemicals are caused to expand within the tank up to a level higher than the uppermost tubular member . the tubular members are thereby embedded into the foam . after hardening of the foam from the formed foam block foam coated rod - like elements are cut out each containing embedded therein one tubular member .