Seed bombs were originally developed by guerrilla gardeners to transform bare public spaces, such as traffic islands, into little oases of greenery and colour. However, the small balls of seeds, potting soil and clay can also be used to make your own garden bloom, and they’re easy to make yourself. The best way to do this is to use seeds from native plants. The DIY Academy in the German city of Cologne recommends chamomile, lavender or poppy seeds. However, you can also use ready-made mixtures with wildflower seeds if you prefer. To make them at home, in addition to your chosen seeds you will …