Seed balls, simply put, are a method for distributing seeds by encasing them in a mixture of clay and compost. This protects the seeds by preventing them from drying out in the sun, getting eaten by birds, or from blowing away.
Seed balls are scattered directly on the ground, not planted. Self-sufficiency and sustainability website Path To Freedom says seed balls are useful for seeding dry, thin and compacted soils and for reclaiming derelict ground (which is why they are often used in guerilla gardening). Seed balls are particularly useful in dry and arid areas where rainfall is highly unpredictable. I like ‘em because they’re easy to chuck over fences into empty lots.
You can “sow” your seed balls on a sunny day – and just leave them. When sufficient rain has permeated the clay, the seeds inside sprout and are aided by the nutrients and beneficial soil microbes surrounding them. I put one (shown above) in my garden so I can track its progress and show my readers that – yes! – seed balls do actually work.
In fact, the seed ball method has been working for centuries. It's been written[verification needed] (where?) that some North American First Nations’ tribes used seed balls. More recently natural farming pioneer Masanobu Fukuoka has experimented with them and promoted them. And in New York City, seed bombs were used in 1973’s revitalization of the Bowery neighbourhood and the development of the city’s first community garden.
More recently, they are used as a key ingredient in guerrilla gardening.
 Notes and references
 See also
- http://www.youtube.com/watch?v=dWyduWsoy8o video of seedballs dropped on barren, rocky dessert.
- other names for seed balls
- Heavy Petal posts tagged with "seed-bomb"
- Posts in Imagina Canarias (Spanish blog) with "seed balling": 1, 2 (in minute 17 a machine is showed which makes 40 thousand seedballs a day, enough (they say) for an acre a day) and 3.