Talk to me about blackspot resistant yellows...
fduk_gw UK zone 3 (US zone 8)
6 years ago
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fduk_gw UK zone 3 (US zone 8)
6 years ago
A couple of random snapshots, so you can see what I'm working with. If I zoom out to get the whole plants in out you can't see how bad they look. I assure you,they're like this allllll over.
portlandmysteryrose
6 years agolast modified: 6 years agofduk_gw UK zone 3 (US zone 8) thanked portlandmysteryroseRelated Discussions
most blackspot resistant hybrid tea?
Comments (42)MichaelG posted a formula to treat botrytis a few years back that worked wonders. The chemical base was calcium nitrate or some other form of soluble calcium if I remember well. It had to be sprayed on the rose blooms before they opened. Worked like a charm, the material was cheap and not dangerous like Daconil or the extremely expensive stuff like Degree (??). The best compound is not available here in the south but for those in the north who still have snow can be bought now because it is used for melting snow - I just cannot recall the name, since I never saw it here. Maybe calcium sulfate? (???) Michael, if you have the article or the summary handy, would you be kind enough to re-post it? I know that I saved it somewhere but it will take time till I find out where....See MoreBlackspot resistant roses other than Knock-Outs
Comments (26)Far different zone and growing conditions than yours and all of my roses are own root as root stock does not do well for me. I had close to 350 rose bushes here. When I decided to go no spray it took two years to eliminate all take were not healthy. I was left with mostly Kordes, Ping Lim (Easy Elegance), Flower Carpet and a few misc. The midwest has the highest humidity index after the gulf states in the US. So good disease pressure here. However we don't have rust or downy mildew issues here. That I know of. I've had my kordes roses for ten plus years and many have been renamed.Ex.my Petticoat Fairy Tale is a gorgeous apricot orange pink blend. Size is 4' by 4' here starting with no cane in spring. Petticoat is now sold as a white rose. I only ordered the Kordes roses that have won an ADR that said none have ever had any disease at all. As a whole they grow much larger than their stated average size at least here in my yard. Buy Kordes adr roses you won't regret it. Ping Lim roses are sold own root. Don't know if you can get them on fortuniana stock if thats what you need.The best of the best is sunrise sunset (shrub type). Size here is 4' by 8'. All that I've tried are disease free but some have lacked in vigor. Other disease free roses in my yard are- Gartendirektor Otto Linne Kateryna Betty Prior Easy Does It Roserie de l'Hay Cape Diamond- don't prune it or will throw wild growth from every dormant bud on cane- ask if you wish to know more Flower Girl Home run White Out- thou I have heard some have problems mine has been perfect-own root don't now that it matters Pretty In Pink Sunshine Daydream Quietness...See Morea simple list of blackspot resistant roses....
Comments (14)Hi Hidden, Welcome! I am in zone 6 in south central PA. Here Mary Roses seem very resistant as far as the pinks go. Beverly is too but her form is more traditional. Heritage is very David Austin in form and has a lovely scent. Here is something to consider though. I have planted the same roses in two locations on the property. One rose will get get black spot and one will not. Rather than blame it on the rose, I imagine it has to do with growing conditions like sun and airflow or the weather in general. Since BS and Powdery Mildew are the 2 banes of my roses I thought I would share this. I just re-watched Gardeners World season 2016 episode 22. Monty Don, my guru for organic gardening, mentioned that Powdery Mildew was caused by the plant being too dry. I had never considered that. So this year at the first sign of PM on my roses or clematis or honeysuckle, etc I am upping my watering frequency....See MoreBlackspot resistant Bourbons
Comments (6)It's kinda something you have to figure out for your particular area. I have a few Bourbons here, and they vary with respect to blackspot resistance -- but that also has to do with the particular strains of blackspot in my area. The cleanest for me is 'Souvenir de Victor Landeau' but this is, unfortunately, no longer in commerce. If you look it up on HelpMeFind, the most recent pic is of my plant. Here, it doesn't get spotty leaves until about October, and then only on the lower 1/3. But honestly, by then it's of no concern to me, since everything is getting ready for sleep anyway. I'm hoping to propagate this in Spring, so if it catches your fancy, I'll put you on the list for one. 'Mme de Sevigne' is the next cleanest for me. Think of it as along the lines of 'Mme Isaac Pereire', but with even more of a climbing habit. So far for me, its canes are stiff enough to be basically self-supporting, so in my garden it's like a free-standing climber. If it gets too heavy with the first flush, I just prop it with a tree branch stuck in the ground. 'Honorine de Brabant' is a close third for me. It will get naked legs by mid-Summer, but the leaves it keeps are barely affected. The ones it loses seem more due to it growing up and out than disease -- those lower leaves just seem to become "no longer necessary" and are shed. But this is just the lower two feet or so on a rose that topped six feet by the end of the season. "Maggie" is a Bourbon often touted as being rather healthy, but mine is too young to comment about it. Mine came less than a year ago, and is all of 12" now. It kept healthy leaves so far. I also have 'Souvenir de la Malmaison', and it is also very clean here as far as blackspot goes. But mine is in a bit of a challenging spot right now, and it does get a touch of mildew when it's cold and wet. Here, that's just a bit in Spring before blooming, and again in Autumn. It's nothing major, and clears up on its own when it gets either drier or warmer -- or both. For me, 'Mme Dore' and 'Mlle Blanche Lafitte' will go naked in mid-Summer, then refoliate. But keep in mind that I don't use fungicides, so if you do, they'll likely be fine. For me it's not worth the trouble or the side-effects. There are three which come to mind as being notorious for blackspot issues -- 'Mme Pierre Oger' and its sport-parent 'Reine Victoria', and 'Louise Odier'. You didn't mention having them, so I'm just throwing that out there if you were considering them. But keep in mind that many people say the same about all the ones you did mention, except for 'Souvenir de la Malmaison'. So if those are doing well for you, perhaps you're not in an area as prone to blackspot. There are also a few Hybrid Perpetuals which lean toward the Bourbons in appearance. The class is really a hodge-podge -- basically, if it rebloomed at all and wasn't clearly one of the other types from that time, it got the Hybrid Perpetual label. So if you line them all up, you see how variable they are. One I'd recommend to someone looking for a "healthy Bourbon" would be 'Pierre Notting'. Note that there is also a Tea called 'Souvenir de Pierre Notting' -- I'm not talking about that rose. The one I mean is a somewhat like 'Mme Isaac Pereire' in habit and bloom form, but smaller in plant size and a deep wine-red in bloom color -- and also very fragrant. My plant is very healthy -- almost as clean as 'Souvenir de Victor Landeau'. But as I said before, keep in mind that that's how it is for me. One thing I'm finding with blackspot-prone roses is that if they are kept well-fed and well-watered, they will quickly replace shed leaves. In my garden, it's as though their first set of leaves is made for Spring conditions -- perhaps enduring some late frosts -- rather than Summer conditions. If blackspot makes those first leaves fall, the second set seems more "Summer-ready" and will last through the season. Of course, there are a small handful that seem to struggle anyway, and I just may give them a little help with sulfur this year. And I want to try giving everything a wash-down with Castile soap in a hose-end sprayer. Supposedly, it both washes off the spores and leaves a residue that prevents new spores from germinating. We'll see if that works. If you're not sure what will work for you, I'd suggest growing them in pots around the garden for a year or two before deciding to stick them in the ground. Of course, you'll have to deal with those potted roses for Winter. But I find it easier to dump a poorly-performing plant when I don't have to dig it out of the garden. :-) ~Christopher...See More
mad_gallica (z5 Eastern NY)
6 years agofduk_gw UK zone 3 (US zone 8) thanked mad_gallica (z5 Eastern NY)
fduk_gw UK zone 3 (US zone 8) thanked Cathy Kaufellfduk_gw UK zone 3 (US zone 8)
6 years ago
dublinbay z6 (KS)
6 years agolast modified: 6 years agoMy best yellow is Harkness's Well Being. It will occasionally get a bit of BS, but not a lot. In fact, I rarely do anything about it--the rose just goes on producing new leaves and blooms periodically throughout the summer.
The buds tend to be reddish and newly opening Well Being blooms often sport a thin reddish line around the bloom petals.
However, it usually loses all hints of the reddish color as the bloom matures.
It is cold hardy to zone 6B--that shouldn't be a problem for you. Mine has to be in a semi-protected spot to beat the cold, but I've been growing it for 5 or 6 years with no problem, even though I'm in Zone 6.
Mine gets about 4 ft tall--planted in a better spot and watered more regularly, it might grow somewhat taller. It's shape is typical floribunda.
Hope that helps. : )
Kate
Kelly Tregaskis Collova
6 years agoKelly Tregaskis Collova
6 years ago
Dave5bWY
6 years ago
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