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I recently heard about seed balls (small balls of clay, soil and seeds mostly used to add plants to abandoned areas) and while I very much like the idea I was a little bit skeptical of their effectiveness.

Could anyone with experience describe how effective they are, and how to maximize their effectiveness?

The only related question I could find on SE was this one, which highlights a few important parameters to keep in mind (humidity and integrity of the ball) but doesn't say anything about the success rate of well designed balls and doesn't give a particular recipe: How to properly seed bomb a particular area with drones

While I would really like learning about general guidelines, if such general recommendations are impossible to give, I am more specifically interested in the effective design of seed bombs for urban areas of western Europe, hardiness zone 6, with seeds that promote future growth (seeds that can survive and maybe help with soil compaction as well as poor soil quality).

  • By the way, there is no 'guerrilla-gardening' tag for now on the SE. If someone with enough reputation thinks it would be a good addition, be my guest. – A.N. Mar 31 '18 at 14:19
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    done. I think it is a difficult question, because there is no controlled environment to test different seed "bombs". I find often there is no good scientific background on building seed "substrate". Nature is strong, so I would prefer to choose good seeds (good species, for specific environment). Seeds will find their way. – Giacomo Catenazzi Mar 31 '18 at 15:02
  • @GrahamChiu The link is highly relevant, and that article is one of the reasons I decided to ask this question. It explains very well the difficulties of it, but some people are still reporting success with seed bombs so said difficulties might get overcome (the question being whether it can be done systematically or if successes are just dumb luck and do not come from a particularly crafty design). – A.N. Mar 31 '18 at 20:25
  • Your question is a bit broad at present. You need to specify what location you're trying to seed, and with what eg. Native seeds – Graham Chiu Mar 31 '18 at 20:31

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