Hibiscus Plants

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  1. What to Do With Struggling Hibiscus
  2. Hibiscus Outdoor Care in Tucson
  3. Planting Hibiscus in the Ground-Zone 8
  4. Hibiscus Pruning
  5. Foliage On Flowering Tree Being Eaten
  6. Yellow Leaves/Hibiscus Plant
  7. Aphids on My Hibiscus
Asked by pete12 on September 1, 2011
What to Do With Struggling Hibiscus

In southern England I have 3 hibiscus plants. The blue one is fine and thriving, but the 2 maroon coloured ones do not flower. The flower head starts to develop but stays very tight and very small. These two are in different parts of the garden. The flower petals stay so tight and small that they do not come out at all. Please help!

ANSWERS
Heather
Certified GKH Gardening Expert
It sounds like you may have thrips. They are very small pests that attack the base of flower buds and cause them to fall off before they open. This article will help: http://www.gardeningknowhow.com/plant-problems/pests/controlling-thrips.htm There is also a possibility that they are not getting enough water. The plant will drop its flower buds if it is underwatered. It would not hurt to increase water to the plants for a bit and see if that helps.
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Asked by Anonymous on September 2, 2011
Hibiscus Outdoor Care in Tucson

How much sun should my hibiscus get when outdoors in Tucson? Should I keep it in the shade always or will it tolerate direct sunlight?

ANSWERS
Nikki
Certified GKH Gardening Expert
While this plant enjoys full sun in most areas, it may get too hot in your location. Therefore, you may want to consider placing it in an area that receives partial shade during the hottest part of the day. You can also choose to grow the plant in a container and move as needed to protect it from sunscald.
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Asked by Anonymous on September 2, 2011
Planting Hibiscus in the Ground-Zone 8

Can I cut the hibiscus back and mulch before winter months in this zone with good results?

ANSWERS
Nikki
Certified GKH Gardening Expert
You can, but really the best time to cut back hibiscus is spring. This article will help with that: http://www.gardeningknowhow.com/ornamental/flowers/hibiscus/tips-for-pruning-hibiscus-plants-when-to-prune-hibiscus.htm As for winter protection, a good layer of mulch should be plenty in your area, as long as what you have is a hardy variety and not tropical.
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Asked by Anonymous on September 2, 2011
Hibiscus Pruning

My hibiscus tree is about 5 feet tall. It is now in the house. Can I prune it?

ANSWERS
Nikki
Certified GKH Gardening Expert
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Asked by Anonymous on September 3, 2011
Foliage on Flowering Tree Being Eaten

I have a Hibiscus. I live in Vero Beach, FL. I am accustomed to bugs that eat new growth and cause flower drop, etc. This is unusual because all of the growth on the lower parts of the branches is affected. I guess it has been eaten, though I cannot find evidence. I have treated with assorted sprays and systemics. I have looked at it after dark, thinking it was something that came out then. The flower buds and top growth are fine. There are no deer here. I have inspected very closely and see no evidence of any pests. Can you help me?

ANSWERS
Nikki
Certified GKH Gardening Expert
It is possible that it is slugs. They will climb small trees at night to eat the first foliage they come across. You may want to try Diatomaceous Earth around the base of the tree. It will kill any bugs or slugs that crawl across it. This article will also helpwith slug control: http://www.gardeningknowhow.com/plant-problems/pests/facts-about-slugs-and-how-to-kill-garden-slugs.htm
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Asked by Anonymous on September 4, 2011
Yellow Leaves/Hibiscus Plant

I have a bright red hbiscus plant that has done very well but is now having most of the leaves turn yellow. I was planning on winterizing and hope to save the plant. Do you know what is causing this and how to help?

ANSWERS
Nikki
Certified GKH Gardening Expert
There are several reasons this can happen. This article explains many of them and will help you decide which is likely for your plant: http://www.gardeningknowhow.com/ornamental/flowers/hibiscus/answers-to-what-causes-hibiscus-leaves-turning-yellow.htm
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Asked by Anonymous on September 4, 2011
Aphids on My Hibiscus

I have tried numerous things and it’s getting expensive. It was beautiful but the bush and tender leaves are being infested with pesky aphids. They are killing my hibiscus, which is 3 feet tall with large, 8-9 inch pink and cranberry blossoms. Help.

ANSWERS
Nikki
Certified GKH Gardening Expert
This article should help you: http://www.gardeningknowhow.com/plant-problems/pests/homemade-aphid-control-a-natural-way-to-kill-aphids.htm You may also want to try neem oil. This is very effective against aphids. Here is more information: http://www.gardeningknowhow.com/problems/pests/neem-oil-uses.htm
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