I am not at ALL an expert. After some years of trying to grow strawberries in our sandy soil without success I decided to make some self watering containers. That should keep them more hydrated. I used coconut coir and osmocote and they did very very well. I was the first time we had a decent harvest of strawberries so I'll continue in the same way.
My self watering container are window box style too. Only little soil fits in there (which dries up quickly) and they like moisture. But with the water reservoir under them the coconut coir stays moist.
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