Well, Craig, there are a lot of factors to consider. Firstly what are you growing and where? What are the seasonal problems where you are? For instance, when I go away, as I grow Phalaenopsis, mainly and I'm in the north UK midlands, I water them well, position them in a light place but out of direct sun and they are fine. If you are growing things in a greenhouse or under grow lights, or they need humidity or fans running then you may need to set up timers. If they need a lot of watering you may to ask a friend to come in.
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