I sprayed my hibiscus with neem oil for powdery mildew. Now the leaves are yellowing, only one or two at a time, and no new growth is occurring.
There can be several reasons for yellowing leaves on Hibiscus.
This article will help you access the plant.
I've had a habiscus bush for 10 or more years, for the past 5 it has had plenty buds but they have not bloomed. This year it looks healthier than before, the leaves are really green & there is a abundance of buds but still not flowering. You advice would be appreciated please
There are a number of tiny insects that can ruin buds. You will need to be a real sleuth to pin down which one may be causing buds not to open. Here is an article that runs down the possibilities. Click on each insect for more information on that pest, how to ID it and treat it.
https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/hibiscus-flowers-hibiscus-blossoms-falling-off-plant.htm
After 8 weeks can the habiscus cutting be planted outside
As long as when you pull it out of the container and the roots fill the container, then you can plant it out. Planting before the roots have fully formed will result in a dead shrub. So as long as the roots fill the container, then it will be safe to transplant.
I have several Hibiscus plants in my yard. They have been there for years. Being in New Jersey they usually bloom around fourth of July. This year one of them has not bloomed and its August 7th. It looks healthy other them some leaves look curled up on ends. We have had a lot of rain this year, but all my other ones bloomed on schedule. Attached is two photos for you to maybe give me an idea what's up? Thank you for your time Bob Garatty
I noticed that it is only new growth that is affected. To me, this is a sure sign of aphids or thrips. Both damage tender new stems and buds. So get up real close 'cause these are very small insects. Aphids can't fly and can't walk very much. A blast from the hose that knocks them off is usually enough of a treatment. The links below talk about aphids, thrips and other hibiscus pests.
https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/pests-on-hibiscus-plants.htm
It looks very similar to a stink bug but without the smell. What are they and how do I control them with killing the good bugs? Thanks so much for your help!
Stink bugs are a known pest of hibiscus. They don't necessarily smell until they are disturbed or crushed.
https://www.pestworld.org/pest-guide/occasional-invaders/stink-bugs/
Here are some other possibilities:
http://ipm.ucanr.edu/PMG/GARDEN/PLANTS/INVERT/fullerrosebeetle.html
As far as bio-rational control: hibiscus flowers are sensitive so don't use neem oil, horticultural oil or insecticidal soap products. Pyrethrum (chrysanthemum extract) is effective for contact knock down, but has no residual effectiveness as a protective barrier.
I would choose a a pyrethroid, a synthetic version of the pyrethrum chemistry that has knock down power as well as two or three weeks residual effectiveness. It is low toxicity for mammals, but will kill fish and bees and beneficials if you do indescriminate spraying of the entire garden, but if you don't have massive hibiscus plantings and can spot spray your hibiscus buds and flowers, you will do minimal damage to non-target organisms.
https://www.domyown.com/monterey-bt-insecticide-p-2821.html
My hibiscus has been looking droopy and has these spots on the leaves . Could it be getting too much sunlight ??
It's possible that the brown patches are sunburn, but I don't think so. Its not exactly characteristic of sunscald which usually has transitional areas of discoloration surrounding the necrotic tissue. Hibiscus is normally tolerant of full sun, unless under-watered and drought stressed.
A photo of the entire plant showing how much of the plant is affected, and the site conditions would help us to determine what is going on. As well as a description of your soil and water management.
The bush has been in my garden for over 30 years and always is beautiful. This year however, half of the plant seem to have died and the other half is looking very sorry for itself. The leaves are yellow and curling and the flowers although budding and trying to open are looking very wrinkled and unhealthy when they open, they do not last very long. Have you any advice.
I sounds like a pest or fertilizer problem. Have you done anything different with it than you would? If not then check it for bugs and pests. They may have affected it near the root system.