Call 855-660-4261 with your lawn & garden questions every Saturday from 8:06am to 10:00am ET. Then listen to Mort answer your questions. Or email anytime at questions@themagicgarden.com
Listen to the weekly archive 24 hours a day 7 days a week on demand.
Keyword Search Results for:
Rose of Sharon

9 Found

Question: 460-3510
Should Rose of Sharon be trimmed to six feet each year? Tom. Can I cut back my 15 foot Rose of Sharon ? Joe, Norwich, CT

Mort's Answer:
Hibiscus rosa-sinenesis will sometimes grow to 20 feet. Keeping it at 15 feet is easier than six feet. It will grow to 30 feet in the tropics. Usually a ten foot tree will flourish in zone 6. It can be cut in the early spring or late fall without taking flower buds.

back to top




Question: 609-3511
I have about eight Rose Of Sharon in pots. They were planted from seed from my dad's plants in Chicago. They are a foot tall. The under leaves are loaded with flying bugs that are laying eggs. What can I spray? Wally, Barlett, TN

Mort's Answer:
Malathion is still the most effective insecticide for white fly. You can clean the eggs with a Q tip and alcohol.

back to top




Question: 626-4011
I have about eight Rose Of Sharon in pots. They were planted from seed from my dad's plants in Chicago. They are a foot tall. The under leaves are loaded with flying bugs that are laying eggs. What can I spray? Wally,

Mort's Answer:
Malathion is still the most effective insecticide for white fly and aphids. You can clean the eggs with a Q tip and alcohol, if you are organically challenged.

back to top




Question: 806-3412
Can you tell me how to start a Rose of Sharon? Patty, Norwich, CT

Mort's Answer:
Rose of Sharon is one of the easier plants to start from cuttings. They are also notorious for spreading their seeds for regeneration. Take eight inch terminal shoots. Take as many cuttings as you can for friends and family.This time of year they may have flower buds or blooms. Remove all but the top two leaves. The bottom should be cut at an acute angle. Build a box near the spigot that is six inches deep. Place the cuttings two inches into the sand. Mist the cuttings every day. Do not overwater except on the first day before the first insertions. They should root by October, You can cover for the winter and move them in the spring. I started two last June and one of them is loaded with buds and is six feet tall.

back to top




Question: 931-1813
I cut my six foot Rose of Sharon in half. I noticed a lot of the buds are starting to swell. Did I stop the shrub from flowering? Tina, Norwich, CT

Mort's Answer:
Since Rose of Sharon blooms in late summer and puts out leaves later in spring than most plants, you have done no harm. You will get more branching and more flowers by pruning. I just cut my Rose Of Sharon back from about six feet to about five feet. Young shrubs have a tendency to grow vase shaped in the early years and do become top heavy with a lot of flowers. My two year old cutting was leaning to the right. So I straightened it out to be more democratic. They are truly beautiful specimens that can be planted almost anywhere.

back to top




Question: 1305-4015
My Rose of Sharon is 12 feet high and needs to be pruned. It is thinning out. When can I cut it and how much? Jack, Ashburnham, MA

Mort's Answer:
As soon as the flowers have dissipated, you can cut a third off the top. Often times, when shrubs get leggy, it is because of too much nitrogen fertilizer. Adding some granular 5-10-10 fertilizer to the soil this fall will strengthen the stems and help produce more flowers. Too much shade also can make plants reach for the sun. If this is the case, you could consider a transplant this fall or next spring.

back to top




Question: 1314-4115
My nine foot Rose of Sharon has dropped its second wave of buds. Is this normal? Darby, Griswold, CT

Mort's Answer:
It is if you have not fertilized in the last five years. Hibiscus syriacus can grow top 15 feet. Make a circle around the stem about four feet away. Make six holes that go down at least two feet. You can use a crowbar or a tire iron. Fill the holes with 5-10-10 or 5-10-5 fertilizer. This will add strength to the flower bearing branches and extend your blooms.

back to top




Question: 1365-3116
My Rose of Sharon is coming into bloom and it is above the window. When can I cut it back? Dottie. Griswold, CT

Mort's Answer:
Rose of Sharon will put out buds in the spring. It is best to prune all flowering shrubs immediately after they have finished their blooming. Hibiscus syriacus which is sometimes called Althea has a vase shaped growth to 5-15 feet. It can be held to six or eight feet with a more shrub like growth. You can cut it back a foot each late summer. Eventually, you might consider a move to a more spacious spot. H.moscheutos, aka mallow, has a flower that can be 10 inches across. H. moscheutos gets about five feet high. This herbaceous mallow can be cut to a foot from the ground every fall.

back to top




Question: 351-5201
I transplanted a Rose of Sharon last week. It is starting to wilt. What can I do to save it? Joseph, Southport, NY

Mort's Answer:
Deciduous shrubs and trees need to be defoliated before the roots can be disturbed. As Caesar said, łThe die is cast.˛ You need to cut the plant in half to conserve the energy from the roots. Water thoroughly for four days in a row. After that you can cross your fingers. Do not water after that time, unless we are experiencing a drought. You don't want to rot the roots. Do not fertilize. Next time you Śll know better. Evergreens have a resin that seals the leaves and restricts transpiration of the water. Any deciduous plant can be planted any time, so long as it was dug during defoliation. It can not be dug, when it has leaved out. Good luck. It might survive.

back to top