Think of water filled tubes as insulators during the day and then as the sun goes down heat dissipation is the function- the temp remains more constant as night time temps cool. In our southern states, for that second planting the water will actually insulate the plants from the burning Texas sun during the day, but not cool rapidly at night.
I actually don’t use Wall ‘O Waters as season extenders – I use them as plant protectors to shield the tender seedlings. Curious birds and rabbits, gusty winds, cutworms, since I put down Diatomaceous earth around the inside at planting time.
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Tomatovillain
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