Ask a Question forum→Flowering quince leaf black spot

Views: 93, Replies: 2 » Jump to the end
San Jose, California
May 11, 2020 10:45 PM CST
I got one quince plant(double take pink storm from PW) in early spring, then plant into a big pot in backyard(16-18 in diameter) . It has at least 8 hours full sun and now it is turn to hot in San Jose(zone 9, 75-85F). It starts grow quickly and flowering a lot, I thought it is strong and didn't pay attention every day. Recently I found aphids then applied the selvin pesticide(some leaves still show a little white powders).

And I also notice watering every week in this hot climate may be two dry for the quince.Because I found the inter leaves seems all yellowed and dried. So I start to water every 3-4 days when top soil become dry for some time. It start to show signs to grow better now. However it developed black spots on the leaves, not sure if I need to treat that? Am I watering too much? Also I noticed quite some spider nets like threads around the plants(see the last photo), not sure it that matter?

Photos attached. Thanks in advance!

Thumb of 2020-05-12/weipe007/ddd6cc
Thumb of 2020-05-12/weipe007/303ad6
Thumb of 2020-05-12/weipe007/03d165
Thumb of 2020-05-12/weipe007/dbdd1f

[Last edited by weipe007 - May 11, 2020 10:47 PM (+)]
Give a thumbs up | Quote | Post #2235810 (1)
Name: one-eye-luke US.Vet.
Texas (Zone 8a)
Quitter's never Win
Hummingbirder Birds Organic Gardener Dog Lover Cat Lover
May 12, 2020 12:50 PM CST
Your plant is in a stressed state because the sun hits the pot and cooks the roots. If you stick a oven thermometer in the pot in the hot part of the day you are probably hitting upper nineties in the pot. The soil and black pot collect and holds heat and will get hotter than the outdoor temps by the end of the day. In the nursery business they use shaded areas just for that reason. Greenhouse also uses shade cloth to protect the roots from getting to hot. I put all my outdoor container plants under a shade cloth areas in the Summer. My Summers run in the 100s every year and I learned the hard way, like you.
NOT A EXPERT! Just a grow worm! I never met a plant I didn’t love.✌
San Jose, California
May 15, 2020 6:55 PM CST
Thanks Luke!
Your give me a good hint! I was thinking to transplant the quince to the front yard near the road. Or maybe I can change to a lighter color pot. Setup a shade is not easy in my backyard as the kids keeping on breaking the stuffs.
What do you think?

« Homepage
« Back to the top
« Forums List
« Ask a Question forum
Only the members of the Members group may reply to this thread.

Member Login:

[ Join now ]

Today's site banner is by ge1836 and is called "Monkey Flower"

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.