Miscellaneous

Information About Rose Of Sharon

Information About Rose Of Sharon


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Rose Of Sharon Problems – Dealing With Common Althea Plant Issues

By Darcy Larum, Landscape Designer

Rose of sharon, or althea shrubs as they are commonly called, are usually low maintenance, reliable bloomers in zones 5-8. However, like any other landscape plants, rose of sharon can experience problems with specific pests or diseases. Learn more here.

Rose Of Sharon Fertilizer Guide: Learn How To Feed An Althea Plant

By Darcy Larum, Landscape Designer

Sometimes, as gardeners, the things we do to try to help our plants can actually harm them. For example, rose of sharon shrubs can be very sensitive to over-fertilizing. Learn how to fertilize an althea shrub correctly in this article.

Rose Of Sharon Winter Care: Preparing Rose Of Sharon For Winter

By Darcy Larum, Landscape Designer

Rose of sharon is usually planted in the ground but it can also be grown in containers as a lovely patio plant. Whether in containers or the ground, winter care for rose of sharon may be required. Learn more about overwintering rose of sharon here.

Moving Rose Of Sharons – How To Transplant Rose Of Sharon Shrubs

By Teo Spengler

With a stiff, upright habit and open branches, rose of Sharon works in both informal and formal garden arrangements. Transplanting a rose of Sharon shrub is not difficult. Click this article for tips on how and when to transplant this shrub.

Yellowing Rose Of Sharon Leaves – Why Rose Of Sharon Has Yellow Leaves

By Mary H. Dyer, Credentialed Garden Writer

If you notice your rose of Sharon has yellow leaves, you're understandably perplexed about what has befallen this trusty late summer bloomer. Click this article to learn a few of the most common reasons for rose of Sharon leaves turning yellow.

Is There A Blue Hibiscus: How To Grow Blue Hibiscus In Gardens

By Becca Badgett, Co-author of How to Grow an EMERGENCY Garden

You might be wondering if there a blue hibiscus plant that you should have heard about. Actually, blue hibiscus flowers are not really blue and not really hibiscus plants. Learn more here.

Pruning Rose Of Sharon Shrub: Tips On How To Trim A Rose Of Sharon

By Becca Badgett, Co-author of How to Grow an EMERGENCY Garden

The rose of Sharon shrub flowers on growth from the current year, allowing optimum opportunities for when to prune rose of Sharon. Pruning rose of Sharon shrub may be necessary at times and this article can help.

Rose Of Sharon Care: How To Grow A Rose Of Sharon

By Becca Badgett, Co-author of How to Grow an EMERGENCY Garden

Growing rose of Sharon is an easy and effective way to add long lasting summer color with little fuss. Care for rose of Sharon is minimal and can be made easier using the information in this article.


How to Plant a Rose of Sharon Hedge

Rose of Sharon (Hibiscus syriacus) is a hardy hibiscus that is often grown into a hedge in many different climate zones. As far north as USDA climate zone 5 (Iowa and southern Illinois), gardeners value this plant for its pretty summer flowers and attractive foliage that you can prune to whatever shape you want.

Determine a sunny location for your Rose of Sharon hibiscus plants and then measure the length of the planting area. This plant needs 4 feet between plants, so plan accordingly before visiting the nursery. For example, if you want a 20-foot hedge, purchase five plants.

Measure 4 feet between planting holes and then mark their locations with anything handy, like a trowel or bucket.

Dig holes in the places you marked. Make sure the holes are larger than your plants’ rootballs and add in one large shovelful of organic compost, one cup of Perlite or vermiculite and one shovelful of peat moss into each hole. Thoroughly mix these ingredients into the soil.

  • Rose of Sharon (Hibiscus syriacus) is a hardy hibiscus that is often grown into a hedge in many different climate zones.
  • Measure 4 feet between planting holes and then mark their locations with anything handy, like a trowel or bucket.

Plant your Rose of Sharon plants into the holes you prepared and then backfill with the soil you dug out. Pat the soil down firmly around each plant and water them well.

Trim your Rose of Sharon plants into the hedge configuration you want when they begin to send out rapid new growth at the beginning of spring.

When you prune your Rose of Sharon, start by cutting off any diseased or damaged branches. A weekly application of any balanced fertilizer that you mix to half strength will give your hibiscus the nourishment it needs to grow large and healthy and produce the maximum number of flowers.

To prevent the introduction of any plant disease, wipe off your clipper blades with a clean rag you have moistened with hydrogen peroxide, isopropyl alcohol or bleach. Reapply the solution every five cuts. Do not prune your plants in late fall because winter frosts can damage unprotected leaves and branches that will be exposed after you prune.


Planting cape mallow

It is best to plant them in the spring, after the last freezing.

For plants purchased with their roots bare, planting is best done in fall.

  • Cape mallows flower best when planted in a well-lit place.
  • They like light and well drained soil.
  • Provide for regular watering over the first year.
  • Refer to our advice on planting shrubs.

This shrub is particularly well adapted to growing in pots. For that, use planting or horticultural soil mix.

Cape mallows can bloom all year long as long as temperatures stay above freezing.

It is possible to grow Anisodontea indoors. For best results, it is best to simulate a period of dormancy: keep the plant in a cool, well-lit spot, that doesn’t freeze.

Propagating cape mallow


Beware of the Rose of Sharon (Althea) in your garden

The Rose of Sharon (Hibiscus syriacus) also known as an Althea shrub is a mid summer bloomer in white, pink, red, or purple with a red center. You can also find them ruffled in the same array of colors including what many call blue. You can grow the Rose of Sharon as a shrub or a tree and many garden catalogs sell them as a fast growing deciduous flowering hedge.

The Rose of Sharon grows in zones 5-9 (but I have seen a listing for up to zone 11) and can be quite a prolific re-seeder. In my zone (7) it can be invasive and pop up where the seeds may fall or the wind takes them. Many sites will tell you that the height can reach up to 10′ tall and 6′ wide but I can confirm that I have a ruffled purple one that is 8 years old and is well over 12′ tall and 6′ wide. It has never had viable seeds yet and last summer transplanted a purple one to the same area of the yard to see if that will make a difference (sometimes plants need another for cross pollination). It grows in most soils and will tolerate the hot summer sun.

About 3 years ago I discovered under the Oak tree on the front corner of my property along the street quite a few seedlings. Since the seedlings were mixed in with the Wintercreeper Euonymous under the Oak tree, I just let them to see what they would do. Well, last summer 2 purple and 1 pale pink bloomed so I dug up the 2 purple ones and left the pale pink one under the Oak by the road. I transplanted one (purple) on the side of my house where it is hot and dry and I put the other one in my back yard. (I believe) the seeds came from my neighbor 4 houses down and across the street. She has a purple one but no one else on my street has a Rose of Sharon that I have found.

Flower is done for the day

My double ruffle blooms around the 1st week in July and shortly after the others start to bloom. I have one in part shade and it has not bloomed yet but has buds. This is a late bloomer and would not be a good specimen tree for any garden because the leaves emerge much later than most other deciduous shrubs and trees. The Rose of Sharon does make a great hedge and I would think about mixing it in with some sort of conifer, evergreen, or arborvitae for winter interest. The Rose of Sharon can be controlled by simply cutting off thee seed heads before the pods turn brown and burst open. If the seedlings emerge, you can simply pull them out of the ground. I threw down seeds late last summer and this spring they emerged. These are fast growing plants. The first year they will grow less than a foot but by the 3rd year my Rose of Sharon tree has reached over 6′ tall. Now I live in zone 7 so I have a longer growing season and a milder winter but I would venture to guess that a foot a year growth until it reaches maturity is not over stating how fast they grow.

The seed pod burst and already released the seeds

The Rose of Sharon can be pruned to control its size. I am not a pruner so I let (most of my) plants do what they will. If you do want to prune I would wait until the last flower blooms and fall arrives to prune to shape for next year. You can also prune in early spring and shape the plant (some gardener says for bigger blooms). The Rose of Sharon can be a bush, tree, or even an espalier (which is training the plant to grow along a fence or wall).

I have never fertilized my ruffled Rose of Sharon and had any disease problems but that does not mean they cannot succumb to blight, leaf spot, or canker. This year, however, there seems to be an aphid problem which I need to address with a shower of Dawn dishwashing liquid in my fertilizer hose sprayer. It has been written that the Rose of Sharon is also one of the favorites of the Japanese Beetle. (so knock on wood that I do not find this out)

There are new cultivars you can find at garden centers and nurseries which are smaller and are not invasive (because the plant does not produce many seeds). The bees love them which is a plus in my book. The Rose of Sharon also tolerates my dry, red clay soil and life under Oak trees which is another reason I have them.

I have so many seedlings because I do not prune off the seed heads. It is easy to identify them and pictured below I have a close up of the leaves for you to use to identify them on your hunt. I would save the pictures and go for a walk in your neighborhood and see who has them. I would ask the gardener (or property owner) if they would mind if you took some seeds or dug up some of the seedlings. Many people will share and asking is so much better than just taking.

I have transplanted these in the heat of summer with great success. Watering is the key to success and transplanting before, during, or after a rain is my secret. Happy gardening everyone and if you ever have a question, just ask.

Creating. Inspiring. Gardening without the rules!

Bloom bud and spent flower

2015 copyrighted material C Renee Fuller @the Garden Frog Boutique

single stem to train as a tree

notice 2 trunks which will grow more into a bush

multiple trunks on my Ruffled Rose of Sharon

another small Rose of Sharon with double trunk


Watch the video: How to Grow Rose of Sharon from Seeds