Plant lots of insect-friendly or bird-friendly plants, either amongst your crops or nearby. They attract natural predators such as birds which eat slugs, hoverflies which eat aphids and bees which pollinate your crops. For a list of wildlife-friendly plants click here.
Sadaqah Jariyah. When a man passes away, his good deeds will also come to an end except for three: Sadaqah Jariyah (ceaseless charity); a knowledge which is beneficial, or a virtuous descendant who prays for him (for the deceased). Narrated by Abu Hurairah, Sahih Muslim.
When you provide a family with the seeds and tools to cultivate their own vegetables to not only feed them but also provide an income, this is known as Sadaqah Jariyah. This type of charity is continuous and its benefits are reaped by both the donor and receiver, even after the person giving it has left this earth.