Basically they fumigate your greenhouse, you don't have to use them but I find them a good idea at the start of the season to make sure that I don't have a house full of undesirables.
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Some of us live in the past, always talking about back then. Some of us live in the future, always planning what we are going to do. And, then there are those, who neither look behind or ahead, but just enjoy the moment of right now.
Which one are you and is it how you want to be?
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