If the area where the problem occurred is shady, perhaps the soil stayed too moist and as such, favored damping off. If this seems possible, cut back on water next year. A blanket of mulch will keep the soil evenly moist. Do keep the mulch away from the immediate area of the plant stems. If you worked fertilizer into the soil this year, don't do so next spring and instead rely on foliar feeding with a formulation skimpy on nitrogen.
Or, you could try annuals that are resistant to damping off. If the area is shady, other annuals like torenia and browallia do well, although neither is as showy as impatiens. You might try wax begonias although I believe their succulent stem makes them somewhat susceptible to damping off, too. Or, if you really want to grow impatiens where there was trouble this year, then try plants of a different variety and from a different retailer next year. Maybe, just maybe, you got plants growing in diseased soil or a variety that was a bit more susceptible than others.
I have an ever-blooming rose on the southeast corner of my home and it flowered beautifully all summer. The problem is that the bush is in a place where I can't enjoy it.
What I have in mind is moving it to the back yard where there's a limited amount of sun during the day, given its easterly exposure.
When's the best time to take a few sprigs of the bush and transplant them? This is another good reason to use organic mulch since it cools the soil and keeps the blooms coming longer. Wilting may also indicate that the plants are struggling in too much sun for too long each day. Water well and, if it is early in the season, transplant young plants to a shadier site. An overdose of liquid fertilizer which is quick-acting, will give them too much nitrogen all at once. They are stimulated to produce abundant foliage, so they have little energy left to produce flowers.
This tender foliage also attracts aphids and other insects. Use a slow-acting, granular product sparingly, in the spring. Nematodes are not insects, but slender, unsegmented roundworms.
They have piercing-sucking mouthparts. Impatiens infested with nematodes look sickly, wilted, and stunted. They develop yellowed or bronzed foliage. Eventually, the plant turns brown and dies, although younger growth may remain green.
Remove and destroy infected plants to prevent the disease from spreading. To prevent verticillium wilt, keep the plant healthy. Plant impatiens in well-drained soil, and then water only when the top of the soil feels slightly dry. Feed plants using a balanced fertilizer. Avoid high-nitrogen fertilizers and fertilize sparingly.
Some impatiens varieties are more resistant to the disease. Downy mildew is one of the most common problems to befall impatiens. Downy mildew is a fungus readily identified by fluffy, pale brown, gray or purplish blotches on the undersides of leaves, as well as the stems and buds. Also known as Busy Lizzie, they are popularly grown as annuals and houseplants because they are beautiful and so easy to grow.
There can be a range of reasons behind an unhappy Impatiens plant. However, there can be fungus-related issues troubling your Impatiens, such as mildew, verticillium wilt. Pests such as nematodes or cutworms can also be the culprit.
Impatiens like the temperature between degrees Fahrenheit degrees Celsius. Temperatures highly above or below this range can cause the plants to die. In summers, if Impatiens are exposed to too much sun, they will wilt and die almost instantly.
Hence, it is crucial to provide them with a cool shady place and keep the soil moist but not overly wet. Plants display signs of unhappiness when they are given too little or too much water. Giving too little water is not as much of a problem as the latter. On the contrary, if you feel that your Impatiens are really thirsty and the soil is dry to the bottom, you can rejuvenate the flowering perennial by giving it a good soak. If the Impatiens are potted, place the pot into a wide bucket filled with water inches high.
Let the dry soil soak up water from the drainage hole and remove the pot from the water after a few minutes. Overwatering is a bigger concern.
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