Thursday, May 13, 2010
Be sure to ventilate your greenhouses
To avoid similar problems in your own cold frames and greenhouses, be sure to water as early in the morning as possible so that water can evaporate off the leaves gradually before the sun gets too strong. Also, be sure to keep air moving as much as possible in any cold frame or greenhouse. Sides that roll-up or down are great features if you are putting up a new hoop structure. Removable end-walls will allow the hoop house to continue to be useful well into the summer: eggplant, peppers, and tomatoes all do better with some shelter from the rain and the extra heat early-on, but you need to keep maximum indoor temperatures below 90* F. or so for the plants to continue to thrive into the summer.
If your greenhouse lacks enough vents to move air passively, you may need to employ extra fans to cool things off. Keeping air moving will also help reduce disease problems such as damping-off problems in seedlings (i.e.- Pythium, Rhizoctonia).