I have a 20 ft. planter of them and they seem to be rotting or being cut at ground level. They have been poor looking this year. Our area has had high temp, humidity and plenty of rain. I am going to have to dig them all up and would like to put something else in there for the remainder of the growing season. What needs to be done with the soil? And what caused this problem?
Sounds like possibly a pest problem, like cutworms, in which case I have found a pesticide granule works well and doesn't harm the plants. Also, I have noticed some of mine look like this in poorly drained, compacted soil. I will be working in some compost and possibly a little sand to these areas of my garden and try again myself, once my cuttings have rooted from the healthy bed of flowers.
I planted several flats of impatiens, which have done for 10+ years. They were doing great. . .then started looking sickly and dying off. Only the stems are left. I went back to the greenhouse I purchased from, they weren't of much help. First, I was told root system was fine, and I didn't water enough, then I was told I watered too much. I live in Syracuse, NY and we have had a hot summer, but it has been hot in prior years and my flowers were fine. Leaves start to turn light green, then the flowers start to thin out, then just the stems are left.
This article will help with pinpointing the likely cause of the plants' demise: https://www.gardeningknowhow.com/ornamental/flowers/impatiens/impatiens-problems.htm
Just in case you cannot save them, you may want to take some cuttings (provided you still have some healthy foliage). They propagate easily and this way you can continue to enjoy them. This article will help: https://www.gardeningknowhow.com/ornamental/flowers/impatiens/impatiens-rooting.htm
sounds like some sort of insect infestation like spider mites did you try spraying them? (I don't really like using insecticides, but sometimes you have to take drastic measures) JenJM
Have a white powdery substance on underside of leaf. What is it? And how should I treat it?
The powdery residue is from a fungal issue called powdery mildew. You can try treating the plant with neem oil. Here is more information: https://www.gardeningknowhow.com/plant-problems/disease/get-the-cure-for-powdery-mildew.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
Our impatiens have suddenly lost foliage. What is wrong?
The soil may have become too wet, which could have led to rotting of the roots or a fungal infection. Treat with a fungicide and allow the soil to dry out some.
My beautiful bed of these flowers is a disaster. Something is stripping the leaves and flowers, leaving these long unsightly stems. I have dug into the soil and there is no evidence of slugs. Whatever it is, it has moved through the entire bed of over 250 plants.
I would venture to guess that either slugs or cutworms are the culprit in question. Slugs normally feed at night, which is why you wouldn't see them. Neem oil may help with cutworms, as well as most other insect pests. Here is more information: https://www.gardeningknowhow.com/plant-problems/pests/facts-about-slugs-and-how-to-kill-garden-slugs.htm
https://www.gardeningknowhow.com/plant-problems/pests/insects/get-rid-cutworms.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
Try spraying with greenfly treatment and keep the slug pellets down if you live in wet area. Good luck
Impatiens, almost overnight, lose blooms then leaves until all that is left are ugly stems. What could it be and what can I do?
This article should help: https://www.gardeningknowhow.com/ornamental/flowers/impatiens/impatiens-problems.htm
My impatiens, both in pots and in beds, are just stems. I have been growing them for 40+ years and have never before had this happen. I am in middle Tennessee and a lot of my friends have had the same problem. HELP!!!
This article will help with pinpointing the likely cause of the plants’ demise: https://www.gardeningknowhow.com/ornamental/flowers/impatiens/impatiens-problems.htm
Just in case you cannot save them, you may want to take some cuttings (provided you still have some healthy foliage). They propagate easily and this way you can continue to enjoy them. This article will help: https://www.gardeningknowhow.com/ornamental/flowers/impatiens/impatiens-rooting.htm