I read that the seeds need light for germination so you are not supposed to bury them in soil. I will try it this time
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Discussion
Ground cherries are 🔥🔥🔥
Not for germination, but very very soon after.
More about warmth and moisture for germination
As a rule of thumb, the smaller the seed, the less deep they want to be. 1x-2x the size of the seed is a good planting depth. In the case of very small seeds like ground cherry, they can be simply sewn on the surface or covered with a very light sprinkling of soil.