Seedbombs, comprising wildflower seeds, water and fertilizer, are easy to make and add some green to urban landscapes or planting at home. The seedbombs start by molding a clay and compost mixture with water until it is sticky and then adding the seed mixture, which can be salad or mixed wildflower seeds, says Josie Pearl Jeffery, who specializes in seedbomb kits. The ball should then be pushed into a pot or wall or window box. The key is to keep the seedbombs warm and moist.

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