When we water our plants in the greenhouse and especially the seedlings, if we just use mains water we can give them a real shock.
With seedlings this is especially important, they can easily be killed by a surprise chill.
If you have room for a slim water butt in the greenhouse then you can have a constant supply of water at the right temperature and the water butt will act like a storage radiator, absorbing heat in the day and releasing it at night, helping to keep your greenhouse warm at night.
Check out: Water Butts in the allotment shop
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