I built an attached 8' x 20' greenhouse 25 years ago and it is full of tropical plants and some vegetable greens in bins. I often get mildew on the interior glazing which is Kalwall fiberglass and glass. I used to use RD-20 but realized it is not healthy to use especially if growing vegetables. Can anyone recommend a cleaner that will kill the mildew and be safe for plants.(too many to clear aside) I do have some sodium percarbonate which is supposedly "dry concentrated Hydrogen Peroxide" but I think it may have more in it than that. It is the active ingredient in "Oxy Clean" type of products. The greenhouse is a bit big to clean with the small bottles of hydrogen peroxide you can buy at the local stores. But that plus a little dish soap is what I am leaning toward.

Hi AMonell,
Welcome to this National Gardening Association forum. I don't have a greenhouse, but I do have an indoor zinnia project that involves many of the same problems regarding mildew. You could use Physan 20.
http://www.physan.com/
I have used quite a lot of it for many things, including killing algae growth in my potted zinnias.

ZM (not associated with any product or vendor mentioned or linked)

Yes ~ Physan is what I keep on hand also although I don't have a real issue with mildew/mold.

Beautiful greenhouse and pretty plants... @AMonell

Thanks but as I am raising vegetable greens now (not shown but in 2 cement mixing bins under benches with supplemental lighting) I cannot use something that toxic. I'm not 100% organic but when it comes to something I eat or even would get wet with while cleaning overhead I need to stick with something safer. I don't think Physan is listed for vegetables at any stage of growth.

Alexander

For vegetables, be careful with the type of dish soap you use. Not just for organic but some dish soaps can impart their taste to vegetables. Good luck.

Beautiful Epi bloom as well but I could have skipped the snow photo. Brrrr...

try white vinegar ..... full strength

I sure love the inside views!! Do I see a Laelia purpurata?

At this point I would probably try a swiffer contraption with bleach, trying to wipe it down and then see if the mildew can be avoided with better ventilation?

Comes Spring, if possible, I would empty out the greenhouse and scrub it out, using bleach as needed.

Yes Ursula, that is Laelia Purpurata although I have seen identical plants listed under a few other names. I now have 3 or 4 large plants all in need of transplanting and splitting. Here is another shot and a Queen Ann's tears of sorts for "pod" who I see likes Bromeliads!








OH and the Ric-Rac epi I gave cuttings of to Logees on my first visit there to buy plants for my new Green House!

Your plants are lovely as is your greenhouse. How bad is the mold as it doesn't show in the photos.

pod ~ who likes bromeliads as well as all other bloomers.

Ohh wow, I am smitten! You have some gorgeous beauties there!! Looks like you have some chocolate scent in there too Onc Sharry Baby perhaps. And I am so jealous - your ric rac is blooming!! I tried for years. Love the red Epi!