Hey there, cover crop are usually grown before you put the seedling in, the reason for that is because clover andother legumes cover crop will absorb the Nitrogen from the air and fixate it in the roots. The problem is that before doing this they check how much Nitrogen is in the soil and if there is a lot they will use it first and then they will fix the N from the air in their roots.
You have to wait for the clover to flower before mulching it on the soil, that is when the Nitrogen content in the roots will be the most.
In your diary the clover just takes some water & some nuts from your girl.
The idea behind cover crops is really good but you need more information about how legumes fix the N.
Happy growing from France. โ
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