Hello! New to the forum, and looking for some help.
I am soon to be in charge of a greenhouse located on my grounds! It is approximately 1800 sq. ft. I have heard that in the past humidity was a problem and because of that the previous grower filled all the tables with a sand/soil mixture to held retain moisture. This however leads to a spread of disease/insects, it looks very messy, and has caused the tables to rust out. Right now my plan is to install new rolling steel benches to increase our growing space. But I'm unsure of the best route to go concerning humidity levels. In the past the greenhouse has produced Geraniums and Lantana- both successfully, only I do not want to grow geraniums any longer because of our increasing deer problem, as soon as we put them out-they get eaten up:( Any recommendations? Anything I should know before starting this project? I appreciate any help! Thank you!
I'm first going to ask how your going to monitor the humidity level then if it's not where you want it how are you going to control it? I can tell you what I think is an ideal level but that doesn't mean it's achievable or affordable. :)
What actual physical properties of your greenhouse allow for airflow? Does it have fans, top vents, wall openings? More information is needed......
Type "Deer Resistant Plants" into your favorite search engine for ideas.
Years ago most greenhouse propagation was done in sand benches. With hot water pipes below the bench. The sand is useful, if it's clean, but you don't need it if you're not propagating with it.
The high humidity is a forgiving environment for seeds, seedlings and cuttings while they establish their roots. But too much moisture all the time (especially when temps are cool) lead to problems. You need air. Good ventilation. When temps outside are cool and the greenhouse is sealed up tight you never, well practically never, have to water. The moisture is trapped and humidity goes up. Take advantage of any winter sunshine to open the vents and circulate that fresh air. Do your watering first thing in the morning. Make sure 'everything' has good drainage (including the floor). It gets better every year you do it. When every thing goes like you plan it's awfully satisfying. Good luck with your new responsibility.