What diseases do Ninebarks get?
A: The problem is powdery mildew, a fungal leaf disease thats been particularly bad this year on a lot of plants. The disease spores germinate best in high humidity or when its raining a lot, and then the disease itself takes off in hot, dry weather.
Should ninebark be pruned?
Pruning. When necessary, prune ninebark after it flowers or no later than mid-August to maintain its shape and thin out the shrub and improve air circulation. Fully one-third of the branches can be cut out with each pruning; focus on older branches, damaged branches, and those that cross and rub.
Can ninebark be cut to the ground?
Cut branches nearly down to the ground. It is important to cut any branches you remove near the ground. Otherwise, they may hinder the growth of the ninebark and they will affect the appearance of the shrub as well. You can even cut the entire shrub nearly down to the ground if it is out of control.
What kills ninebark?
Two to three quarts (1.9-2.8 l) of Roundup herbicide with water top-killed 62 to 80 percent of mallow ninebark foliage when applied during late foliar development [33].
Should you prune ninebark?
How big do ninebark get?
3 to 8 feet
Ninebark
| genus name | Physocarpus |
|---|---|
| plant type | Shrub |
| height | 3 to 8 feet |
| width | 3 to 12 feet wide |
| flower color | White Pink |
Are there any problems with the ninebark tree?
Ninebark prefers somewhat moist conditions, but is drought-tolerant once established. Healthy specimens show few, if any problems. Possible diseases include powdery mildew, fire blight, leaf spot or witches’ broom. Pests include aphids. Ninebark is generally considered deer-resistant, though some gardeners will experience damage from grazing.
Why are the leaves on my ninebark plant turning white?
The white fungus growing on your ninebark plant is powdery mildew. This fungal disease displays a white, powdery growth on plant surfaces such as leaves and flowers. The disease is not host-specific and may spread through your garden to other plants.
What kind of plant is a ninebark plant?
A: Ninebark, Physocarpus opulifolius, is indeed a native plant in Georgia and can thrive in the right spot. When I did a television show in Cincinnati, we used ‘Diabolo’ ninebark frequently. The deep purple leaf color made it a great background for flowering plants.
What to do if your ninebark shrub is dying?
That said, I have a ‘Little Devil’ dwarf ninebark which is doing fine in the shade of a small tree. Consider moving your shrub to a shadier spot where it won’t suffer from dry soil. Flowers are starting to fade, so remove faded flowers and the stems that hold them. Summer… Post your puzzlers and help others with theirs.
