Rudbeckia Plants Questions & Answers

Q. Rudbeckia

I have a couple of Rudbeckia plants; however, the flowers dry up and look bronzy as soon as they bloom. The flowers in gardening books look pink and pretty. What can I do to make them look healthier?

Answered by
Nikki on
August 27, 2011
Certified Expert

Rudbeckia tends to be yellow and brown. There is a flower that looks similar to Rudbeckia and is pink.This is Echinacea, also known as Purple Coneflower.

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Asked by
linda.johnston24 on
March 24, 2012

Q. how can i shorten the height of my rudbeckia?

I bought a different kind of rudbeckia not realizing the height was 5 feet.

Answered by
Nikki on
March 26, 2012
Certified Expert

While you really cannot do anything about its height per say, you can trim the plants or deadhead to encourage more compact growth.

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Asked by
Anonymous on
April 16, 2014

Q. Rudbeckia

Is there a way to kill an invasive rudbeckia without having to dig it up? Thanks.

Answered by
Nikki on
November 30, -0001
Certified Expert

Unfortunately, unless you want to resort to herbicides, like Round-up, digging the plant up may be the best way to remove it. Getting it before it flowers and subsequently drops seed will help with 'pop-up' seedlings too.

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Asked by
mitchelldoghouse on
May 31, 2015
zone 4 and 5

Q. picture of plant leaves to identify several perennials

I am digging perennials from an old bed where the plants are not marked. I need help distinguishing between rudbeckia and coneflower leaves. Also, need to see what the leaves of a peached leaf bell flower looks like.

Answered by
shelley on
May 31, 2015
Certified Expert

A rudbeckia leaf: http://www.missouriplants.com/Yellowalt/Rudbeckia_laciniata_leaf.jpg
Peach Leaf Bellflower: http://pics.davesgarden.com/pics/2007/10/27/Xenomorf/a763aa.jpg
Eastern Purple Coneflower: https://www.minnesotawildflowers.info/udata/r9ndp23q/pd2/echinacea-purpurea-6.jpg

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Asked by
Johnbohrer14605 on
July 4, 2015
Virginia

Q. Rudbeckia

Something is eating the petals.

Answered by
Downtoearthdigs on
July 5, 2015
Certified Expert

Something has been after mine too! I have found aphids on my plants, but leaf spot can be an issue also.

Treat with Neem Oil, as it works as both a fungicide and insecticide.

https://www.gardeningknowhow.com/ornamental/flowers/black-eyed-susan/rudbeckia-leaf-spot.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

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Asked by
eliseboucher on
September 11, 2015
Zone 4-Smiths Falls, Ontario

Q. Cutting back perennials in the fall

I have planted perennials I never had before. I don’t know if I should cut them back in the fall like we do for hostas and others. They are: Jupiter’s Beard, Gaura lindheimeri, Golden Groundsel (rudbekia), bugleweed, aster, serbian bell flower, wormwood-Powis Castle, Chrysanthemum.

Answered by
Downtoearthdigs on
September 13, 2015
Certified Expert

I'm listing links for the plants you mention.
You generally can leave most perennials to die off themselves. I choose to leave some for winter interest, Black Eyed Susan is quite lovely in the winter.
Cutting the plants back to about 4 to 6 inches in height at the end of the season can help neaten up the garden and make spring clean up easier.

This will help with pruning and winter care.

https://www.gardeningknowhow.com/edible/herbs/valerian/growing-jupiters-beard-plant.htm
https://www.gardeningknowhow.com/ornamental/flowers/gaura/growing-guara-plants.htm
https://www.gardeningknowhow.com/ornamental/flowers/black-eyed-susan/black-eyed-susan-flower.htm
https://www.gardeningknowhow.com/ornamental/foliage/ajuga/ajuga-bugleweed.htm
https://www.gardeningknowhow.com/edible/herbs/wormwood/wormwood-plant-growing-sweet-annie.htm
https://www.gardeningknowhow.com/ornamental/flowers/chrysanthemum/growing-chrysanthemum-flowers.htm

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