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I got my first green house last year and grew tomatoes which unfortunately got blight. It was mentioned that i should have used tap water instead of rain water. Is there a possibility this disease will carry through into this year if I grow a tomato crop again. Thank you
In relation to automatic vent openers, be aware that on a windy day, with sun, the windows will open automatically and the force of the wind can whip out the glass - as happened to me!
The max/min thermometers with some type of alarm are key. Our greenhouse is just in the backyard so I use this system - -.

The chime just keeps going off until the temperature problem is resolved.

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