Seed bombs! I gave these to my friends' kids and they loved the idea of being guerrilla gardeners!! :-) How to make seed bombs. Seed bombs are great for reclaiming derelict areas with thin or poor soil, making them ideal tools for guerrilla gardening. Especially useful for tossing into empty or neglected lots. Best thrown just before a rainy spell to ensure germination
Plastic containers with clear lids get a second life as mini greenhouses. Poke holes in bottom for drainage, fill with seed-starting mix then sow seeds, put lid on container and watch for seedlings. Once the seedlings have sprouted, REMOVE the lid or you'll steam them to death. Soon they'll be ready to transplant to their garden spaces.