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| I am continually having problems with our rudbeckia. They get what looks like silvery mold on their leaves and drooping buds as well as internal stems with dead leaves. Spray regularly with fungicide but they still seem to struggle. Other plants around them stay healthy.
Would it help to feed them? They get some sun in the morning and full sun in the afternoon, but are a little shaded by surrounding tall plants when the sunlight is not coming from the right angle. |
Follow-Up Postings:
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- Posted by ken_adrian z5 (My Page) on Wed, Jun 29, 11 at 12:40
| sounds like powdery mildew.. usually related to damp/humid nights with little or no air movement ... thats when mildews grow and exacerbated by water on the leaves in the evening ... making the leaves wet for dark ... do not water int eh evening.. unless you use a breaker to apply water on the soil only ... and once there.. its there for the season ... you can stop it.. but you arent going to make it go away .. full fall cleanup is requisite though i like rubeckia .. i wouldnt use chemicals to save them ... i recommend moving on to other things... or try moving them out to a full sun area ... where there might be a bit more air movement .... and look into applying baking soda instead of chemicals ... for PM ... google it ... ken |
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- Posted by grandma_gardener_02 z5 PA (My Page) on Mon, Jul 11, 11 at 8:03
| We took down some tall plants near it and moved it to a completely full sun area. And even though it is dealing with the move, it does look better, so maybe getting more air is the answer. Thanks for your suggestions. |
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| All of my David Phlox were covered with Powdery mildew, and I cut them to the ground in early spring. They are now over 12 inches tall and totally healthy. I am hoping they will bloom in August. Betty |
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