1. Rose Blooms Do Not Last?

Asked by 5418 - April 21, 2011

Our rose blooms do not last, we get plenty of blooms but after a day or so the petals start dropping off. Water every 2-3 days, feed every 7-10 days. What might the problem be?

  • I am not sure where you are but if you are in an area where the temperature is very hot right now, that can cause the blooms to open quickly and then fall apart. Many yellow blooming roses have this problem. I have had some that are in a nice opening bud stage when I leave for work and then are totally done when I get home from work on hot summer days. The feeding at 7 to 10 days is a bit heavy unless it is all foliar feedings. Even then it can be a bit much causing heavier foliage growth and less blooming with weak blooms when you do get them. I would cut back on the feeding and use a moisture meter to check the soils moisture around your roses. They may need more water than they are getting if it is hot where you are. They may also be getting too much water if it is not hot where you are. Too much water can make the soils heavy and thus lock out the oxygen that does actually move into and through the soils, this will cause lack lustre performance as well.

    Stan the Roseman
    Consulting Rosarian

2. Tips of Stems

Asked by Anonymous - April 22, 2011

The tips of the stems of my rose bush have turned black, no spotting on the leaves. It’s┬ájust on the stem. What do I need to do?

  • It sounds like you have a little bit of what is called Rose Canker or die back. Sometimes it gets into the canes when pruning the roses or deadheading them if the pruners are a bit dirty. I would recommend wiping down your pruners with some Clorox or Lysol disinfectant wipes, then prune out the blackend ends and seal them with Elmers or some good white glue, but not school glue. This article should also help: http://www.gardeningknowhow.com/ornamental/flowers/roses/pruning-roses.htm

    This blackening can also happen if pruners are a bit dull and squeeze the cane or stem a lot before actually cutting it.

3. Powdery Mildew on Roses

Asked by Anonymous - April 24, 2011

I have a limited budget. I would like a recipe to make spray that removes powdery mildew. I heard that you can use Murphy’s Oil Soap and baking soda. Not sure the ratio of the ingredients, so if you could help me, I would be grateful.

  • There is a product called Green Cure, and here is a link to their website to learn more about it: http://www.greencure.net/.

    If this is still too costly, then here is a recipe you can try: 3 tablespoons baking soda plus 1 tablespoon of Murphy’s oil soap or a lightweight horticultural oil in 1 gallon of warm water. Mix well and let cool. Mix or shake up well again just prior to spraying. Apply this spray every 7 to 10 days until the powdery mildew is gone. Be sure to spray under the leaves as well.

4. Small Insect Infestation

Asked by Anonymous - April 30, 2011

I have found on my roses and columbine large numbers of a small black insect, at most 1/8 inch long and very thin. I had never seen them before; they do not look exactly like thrips. For all I killed with a spray, more appeared and did damage, also on new citrus leaves and flew in swarms. There was also balling of some of my rose buds.


5. Rose Plant Mushrooms and Mold

Asked by Anonymous - April 30, 2011

I noticed this morning that my potted rose plant had a mushroom growing out of it and mold on the topsoil. I took off the mushroom, but I’m not sure what to do now. Can you give me any advice?

  • Sometimes the outdoor use potting soils will be less sanitized than some of the other indoor or even indoor & outdoor use potting soils. Remove two to three inches of the potting soil from the pot (depending on the size of the pot), being careful not to disturb the feeder roots. Then replace the removed container soils with some indoor or duel use indoor/outdoor potting soil. That will usually stop the mold and mushroom problems.

    One other thing to note though. If your potted rose does not have a drainage hole in the bottom of the pot, the soils are possibly staying too wet due to no drainage, which leads to mold once the soils are saturated and have set for a while. This same thing can happen if the pot is in a tray or saucer at the bottom to catch the water that runs through the soils in the pot and that tray is not drained after 30 to 45 minutes. Saturation of the soils will eventually kill the rosebush as well.

6. Black Tips on Rose Buds and Flowers

Asked by Anonymous - May 2, 2011

Our red rose seems to have black around the edges of the blooms. It hasn’t been that hot yet. What would cause this?

  • If the temps have dipped down pretty low at night at any time, it could be a bit of frost burn on the petal edges. Also, some of the darker red roses will at times have nearly black edges on their buds. However, if they are a bit crispy, as well as being black, it is either frost or wind burn since the heat is not an issue. It could also be a fungus, but most likely it is not that or the entire bud would have problems.

7. Thornless Rose

Asked by Louise - May 3, 2011

I was given a piece of a thornless running rose bush and told to just stick it in water and it will root. Is that true?

  • Your best shot is to buy growth hormone, wet the shoot that will be the root
    place it in soil that is for growing seeds, cover with a plastic (spray water lightly first) and out it in your kitchen window.
    I have rooted many plants just by sticking it in a huge pot I have next to my front door, it gets sun buts is sheltered. Also I have rooted tomato clippings
    begonia, onions lettuce, spinach, LOL just by putting the root in a bit of water.
    After they develop root I set it in a small pot
    By the way where did you get a thornless rose, I have lymphadema and cannot have rose.

    Above answer by: mezleona
Read more about Roses

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