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The Rose Doctor's Hospital
Acute Care Center.
Dr. Rose,
Dr. Rose! I'm getting bizarrely small blooms on my roses
(these are 3-4 year old bushes). Where the blooms should
be 4"-5" across, they're about an inch to an inch and a
half. Or instead of getting a nice tea rose form, I'm
getting single or double petals. I'm spraying for bugs,
fertilizing, deadheading, and I adjusted the soil
according to the soil test I had done... The foliage
looks fine. What the heck is going on? I've noticed these
weensie flowers on Memorial Day, Opening Night, Chihuly
and Sentimental, while others seem to be unaffected.
Also, I'm not getting many blooms during the summer,
after a spectacular first bloom in early June. Is this
normal? Is there anything else I can do to encourage
summer blooming?
Thank you -
Linda
It sounds like you have a classic case of over-fertilization, specifically, way too much Nitrogen. This will tend to cause all the symptoms you mentioned, and can cause small blooms (often distorted), but large green leaves. In addition, the next extreme is that stems become bean-stalks, but with small and deformed new leaflets at the tops of the stems. And at that stage you may see "vegetative centers" in blooms. These are blooms that have a green growth in the center of the bloom- usually seen on blooms with many petals in the open bloom stage (like Austin English roses). Your only two recourses are to wait, and dilute. Time will solve the problem- but if you used granular fertilizer it may take several weeks. Removing granular that is still on the soil surface is time-consuming, but helpful. If the problem was caused by liquid fertilizer, that is more transient and may be assisted by Lots of plain watering. I'd take a soil sample and take/send to the Agricultural Experiment Station (New Haven or Windsor), to confirm. You should not have to fertilize again this summer.
Dr. Rose! Dr. Rose!: A: This is usually very important. And most CR's will preach it strongly, especially when the weather is Hot after the new rose is planted. And in some cases (Northeast in late March 2007, when the weather is abnormally DRY [9% humidity in Hartford, I understand}. The underlying reason is that new bare root roses have no established feeder-root system. Those big roots you see are like arteries and veins, but they are useless without capillaries (those tiny, fragile feeder-roots). The plant cannot properly take up either nutrients or adequate water until they grow in and become nestled in the soil properly (that is why you water newly planted roses so thoroughly- to get the soil next to the roots, instead of air). Since there is little water going up the stems from the roots, and since there is still some escape of water from the stem to the atmosphere (aggravated by hot, dry conditions), you want to keep damp soil (or a paper bag) around the stems for a while. When the stems produce leaflets, this is a sign that some feeder roots are established... you can remove the covering (but still best to keep direct sun and hot/dry conditions at bay for a bit longer. This is an important planting step. Those who have planted roses very successfully when ignoring this step have been lucky, not skillful.
Dr. Rose! Dr. Rose!: Ans: Yes, the Bayer line of products has quite confusing labels. This is even worse when you go to the Garden Store to purchase and some of the products are not on the shelves for direct comparison. The store literature is not always available, as well. Many rose societies have reported very good results with these products. In general they are more 'modern' (aka Advanced) than some of the legacy products by Ortho/Scotts. You should go to the Bayer website for a detailed comparison. Specifically: http://www.bayeradvanced.com/productFamily/rose-and-flower-care.html.
Some overview
and personal pointers/thoughts on these products: This will help clarify your quest for the Perfect Rose treatment, as available from Bayer. My discussion is brief, be sure to go to the Bayer website for more details. Everything said above is based on a 'relatively' small garden- say less than 25 plants. If you have a large garden, the Bayer products can be very expensive. If you have more than 50 roses or so, then very concentrated products such as Compass and Banner Maxx (disease) and Merit (TM) (insect control) make much more financial sense. My buddy, Robbie Tucker, does the math nicely about once per year in his Infomercial advertisement in The American Rose magazine. The products I just listed come in rather large containers, and so they can make a double-lifetime supply for a small garden- thus are economical for big gardens.
Dr. Rose!
Dr. Rose!:
We are new to CT and moved a number of
roses (about 15) in larger planters up from Florida in the
spring of this year. They recovered from the trip and did
well over the summer. We plan to leave these roses in their
planters and would like to over-winter them in our garage.
It's a large unheated garage which faces north and it has an
insulated garage door. Somewhere I read that others had done
this for roses in planters and it worked out okay if the
planters are watered once a month. We plan to put them into
the garage about mid-November and take them out about
mid-April when we would resume our regular feeding and
anti-fugal treatments.
Ans:
Good Job!! those that stayed in the south don't have
quite the problem that y'all who moved North do- nasty
winters. Your plan is sound, assuming that the pots you
are using are really large. The goal is not to prevent
freezing, it is to significantly reduce the freeze/thaw
cycles (in frequency, but particularly magnitude) and
to prevent dehydration caused by wind. The unheated
garage does both. From a medical point of view, the
temperature swings and dehydration are similar to the nasty
effects of frostbite on humans. With people, however,
the situation is much more complicated with blood
circulation. For roses, the internal cells build up the
equivalent of antifreeze slooowly as winter sets in, so as to
prepare the plant for the winter struggle. Wildly
cycling temperatures give mixed signals to the plant.
Result: not good. ________________________________________________
Dr. Rose! Dr. Rose!:
Ans:
Spray the
roses for insect pests when the pests are seen in the garden. For Japanese
Beetles this is the very beginning of July in Connecticut. This is “treating the
symptom” medicine, rather than preventive (inoculation) since treating the
symptom is the way the insecticides generally work. JB’s need a much more robust
medication than do soft-bodied aphids, for example. A product that contains
Merit is likely the best wager. Another product is called “Eight”
(commercialized as ‘better than Sevin’). The Ortho products seem to be much
less effective. Picking them off by hand IS effective, if you have the time.
Dr. Rose! Dr. Rose!: A- The quick answer is about a cup of 10-10-10 for each bush monthly in the beginnings of May, June, July and August. But… This kind of like “every human should take a multivitamin every day”. And does not take into account what size human. Infants take the same as adults? Of course not. So the generic advice is for big, adult bushes (HT and big Fl). Mini’s would get about half of this ‘on average’. A BETTER answer is: depends on what the soil needs to have a balanced meal for the plants. You can tell this Only if you have done a soil analysis. Although Nitrogen tends to deplete and need replacing, that is not true of all soil constituents. Salts and potassium (the K in the N-K-P of fertilizer) can particularly build up over time, so you may need 10-4-10 to counteract a potentially toxic condition. And pH, don’t get me started on pH. Soil testing will tell if you have an issue. And if you have been gardening for a while in CT and have not added lime, you probably DO have an issue.
So add what your soil needs based on
good data from the soil test. And feed in proportion to the size of the plant.
Dr. Rose! Dr. Rose!:
A-
Depends, of course. This is
providing magnesium, that seems to encourage good basal shoot development. That
magnesium is necessary in the soil is true. However, in CT, our soil is almost
always naturally endowed with sufficient Mg. A bit more will not hurt. A lot
more, especially if spread at the same time as granular fertilizer, could damage
tender feeder roots if not watered in VERY well.
Dr. Rose! Dr. Rose!: A- Sounds like you are talking about Messenger, try this site for more information: http://www.edenbio.com/usa/ (note- hyperlink is valid, you may need to copy and paste it on your browser. ____________________________________ Dr. Rose, Dr. Rose!:
Where do you prune a cluster rose? I feel
guilty when I prune my floribundas about a foot down the bush to get to the
first set of 5 leaves. I have to cut off a lot of healthy looking leaves to
get that far down. Is it OK to just deadhead?
Griswold, CT
A- There are several
reasons to prune down to a 5-leaf cluster of leaves. Biggest is to
provide the 'average' rose the opportunity to grow a sufficiently strong stem
to support the next flush of blooms. If you just deadhead you may well
end up with thin stems and 'nodding' blooms the next go round.
Dr. Rose! Dr. Rose!:
A-
Generally speaking, shrub roses
excel in disease resistance; HT’s are much less resistant. Floribundas and
miniatures in the middle. Take a look at the several articles and lists in your
website [Rose Culture] for lists of particularly favored roses in the northeast.
Dr Rose,
My rose books says to plant about 3
to 4 foot on center. However, given the
New England winter die back, I wonder if I can plant them closer. The Norwich and Elizabeth Park roses seem to be about 1
1/2 foot on center. I want to plant a broader, can you have too many in a bed?
BW A-
Sounds like your book may be for much warmer climes. 3 ft. centers are
nice, but usually 2 ft. will do in the NE for HTs. Known BIG HTs will do
better with 3 ft. Floribundas and shrubs (when not intended to be a
hedge) will do better at 3 ft or so. Too many in a bed, of for a hedge
is not usually a problem, BUT: you will have to pay More attention to them
since there is less air circulation which aggravates disease (consider the
high incidence of staph infections and pneumonia for those during a hospital
stay), and there is
greater competition for Water! and nutrients. A park like EP looks
much better with concentrated plants and blooms. They have to work
somewhat harder at maintenance.
Dr. Rose: Can gypsum be used in
lieu of lime?
A:
Gypsum
cannot be used instead of lime. Gypsum, also known as landplaster, is
calcium sulfate. It is an economical source of calcium and sulfate but
cannot be used as a liming material because it does not have the capability
to neutralize soil acidity. In fact, applying gypsum to an acid soil (pH
less than 5.5) can have adverse effects on certain plants by displacing soil
aluminum, which is toxic to plant roots. Gypsum is frequently applied to
provide supplemental calcium. But, there is no substitute for lime in
neutralizing soil acidity.
____________________________________________________
Dr Rose, Dr Rose,
What are your thoughts on
fall planting of Roses? Should I withhold all fertilizers in the planting
hole if I do plant?
Jewett
City
A:
Fall planting: Dr. Rose- A: No. Dr. Rose!!!! A: You did not define "the Area". Your best bet would be to go to the Consulting Rosarians on your website and find one near you. Give them a personal inquiry. And then, the criteria for Best deserves focus. Best plants? Best value? Lowest cost (regardless of value)? Closest to my home? Best and Quality are two words used too liberally, in our mind. Dr. Rose: A: Your question is and excellent one. I generally agree with you, but don't know of the fertilizers that may be very low in Calcium (not usually in fertilizers) and Potassium. Check with the dealers in your area. And: I will be out of country for a short while. If others would answer this (if you are knowledgeable) to the web-person then perhaps we can get a quicker grip on the pulse.
Dr. Rose!!:
A: Fung-onil (Ready to Use)
contains the same 'active ingredient' as Daconil 2787 and Bravo
(chlorothalinol).
I do not recommend that as the primary Black Spot preventive spray since I
have found it much less effective than some other products, and it can
damage leaves (phytotoxic) [very severely if used in higher concentration
than prescribed {although not as bad an issue in the Ready to Use form}].
Double Delight is a particular bellwether and will show the effects most
quickly. For a small garden consider Bayer Advanced line of products
(available in many garden centers and Lowe's). Read up on the
Internet before going to buy- there are several products for disease,
insects, plus fertilizer... More effective for disease is
Banner Maxx. It comes in pint bottles (available on the Internet
from such places as www.Rosemania.com and www.PrimaryProducts.com).
Initially expensive, but will last you for years, and is cost effective
(and seems to work better) in the long run. Due to the tiny amount
to be mixed with water, the mixing may be a challenge--- but you need
spray only every 2 weeks, giving you time to get up for challenges such as
that. Daconil 2787 (29.6% chlorothalinol) - Broad spectrum fungicide for control of alternaria leaf spot, anthracnose, black spot, botrytis, powdery mildew and rust with some effect against downy mildew. Known to have phytotoxic effect on foliage. WARNING. Mix 5 teaspoons per 2 gallons.
Dr. Rose!!!
A: About Thanksgiving
weekend, when there have been several solid frosts, and the ground is
beginning to freeze. Look ahead to the weather- if it will not allow
the outdoor work that weekend (or you are out of town) then anytime after
mid November will usually be fine. Remember: your goal is NOT to
prevent freezing, it is to reduce the frequency and RATE of the
freeze-thaw cycles.
A: Too much
nitrogen can cause this, but other causes are development
of a climbing sport (rare), "blind shoots" which can grow
very long, but don't flower (cause unknown, but happens
with some varieties (Chicago Peace, e.g.)), and roses
that really 'want' to be trained horizontally (like a
climber) in order to provide more blossoms. Some
tall HT's actually can grow so tall that you can't
appreciate the blooms properly (e.g. Folklore).
Your call, but I would advise that if the blooms suit
you, let it grow as it wants. If you'd like
stronger canes and more blooms, and if the winter does
not create dieback, then consider pruning the height by
1/3 in April.
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