What you are seeing is growth produced by the rootstock. Hi Raneem. First off, AWESOME tomato plant, I’m jealous. Cuts made over an inward-facing bud encourage growth in the wrong direction, contributing to a crowded, tangled bush. Next, pick off all afflicted plant parts, as well as any on the ground at its base, and throw them in the trash. It seems to be contagious to nearby roses. If it were rose rosette disease, it wouldn’t impact other plants in the garden except for other roses! Hi Lucky, There are a number of reasons that can cause rose leaves to turn yellow (chlorosis to be technical). On May 30, I put her in the garden, bushy and with a new bud, made certain her roots had water and good compost, and and by June 2, some of her leaves were turning a pale yellow/ash, not dusty, both sides, seem to be creeping higher. Please drop us a line in the comments below, or share your own tips and tricks for rose disease management. Looks like your plant has black spot. Choosing a disease-prone rose variety. Any ideas why my Rosa Rugosa has turned yellow? That helps tremendously with flooding and water issues, as does lifting the container onto spacers to allow the drainage holes to do their job unhindered. Any particular Knock Out rose problems that may arise is far easier to manage if noticed early on. It’s available on Amazon. See our TOS for more details. Many roses push out purple-hued new growth. Your garden is supposed to be fun — a place to relax in and recharge your batteries, a source of beauty and pleasure. Is this a nutrient issue or something else?? Can’t wait until he answers! But this comes at the price of requiring lots of attention to detail in terms of plant health and care. But at the beginning of every summer to follow, they suck me back in. I do not want to lose this particular rose. Yes, the rose is in a pot with good drainage including broken up pottery in the bottom (however, the pot is sitting on the ground so that might not be so great). The leaves yellowing and dropping are one of the go-to signs for black spot harassing your plants. We had a very wet spring… Read more », Looks like a case of black spot. Matter of fact I’ve never had any problems with my roses. However, this is a very difficult disease to handle once an infection sets in, so early care is vital. I have never seen so many problems with roses. However, it can also thrive in dry conditions, and that’s what makes powdery mildew such a headache. Use a fungicidal spray once a week or so, being careful not to apply too often so that the blight doesn’t develop a resistance to it. I have one that I’m nor sure about. Treatment: The good news is that downy mildew often clears up w… Great guide! What an interesting little rose! I’ve seen people cut two to three inches below the infected tissue, but I go farther than that if it’s a widespread issue, sometimes removing 75% of an infected stem. Those expensive tulip bulbs you planted last fall never came up. Thanks for the great article. Shorten trailing stems. Invest in a cold-hardy own-root rose, or plant a grafted rose properly and be sure to mulch it well come winter. Thanks for the great article. Black spot can be treated with a few different types of sprays. If I goofed, can I fix it? My soil is a pretty heavy clay (as is much of central Pennsylvania soil), but I’ve amended it with a good organic soil, peat moss, and humus. There are mixed opinions online on how fast mosaic spreads so I am not sure whether I should destroy them or can afford to wait.… Read more ». Any help is appreciated! Roses are beautiful things but unfortunately they also can suffer a host of problems. No need to panic! Fine-tune this directive if it is a grafted plant. I used good quality potting soil, some fertilizer from David Austin Roses, and followed instructions exactly being a nervous newbie to rose care. The soil could be the problem, too. It might be going through a process called reverting, which is as you said when the graft is no longer doing its job. For most problems with Knock Out roses, the spray application of a good fungicide at timely intervals would be considered wise, along with, of course, keeping an eye on the soil moisture levels and nutritional needs of the rose bushes.