Will they have drainage? If so I agree you will need a wetter mix. I keep my pots wet longer by using horticultural grade diatomaceous earth. Well I use Oil absorbent. Optisorb or Napa floor dry. Make sure it is 100% DE. That has worked well. It holds 120% of it’s weight in water, when not saturated holds air in the soil. Slowly releases water as soil drys, keeping soil moist longer. Also adds the needed trace element silicon. You could also add compost in the mix to keep wet longer. Plus compost has the added benefit of preventing root rot. Just add one part DE and 1 part compost to your normal soil mix. Now my normal soil mix includes these amendments for everything. I need to buy some pine bark fines, peat, and compost. I need soil like yesterday and I’m completely out!
I have about 50 pounds of DE, all set there!
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