Tunnel watering.

In a sunny week - as forecast - leaves will lose lots of water; so roots need a plentiful and constant supply.
One generous watering can last for days, much better than a daily top-up. After watering, cover the wet surface with chopped green leaves and/or grass mowings - plentifully, but loosely. Add a bit more surface material at any time.
Replenish water after three or four days according to the weather. Young plants may benefit from light shading.
Empty spaces can be sown with spinach (not perpetual); the young leaves make good salad. Eventually chop up the large old leaves for ground cover and sow some more!

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