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Thread leaf coreopsis

13 years ago

Okay, the threadleaf coreopsis (assumming these are Moonbeam or Zagreb)have started to spread out and flop so I prunned them back almost to the ground. I hope I haven't ruined them. Will they come back and rebloom? There are some more plants that have finished blooming and the heat has got to them, that I plan to do the same. If they come back, they come back. We were gone a week recently and I noticed stuff had grown so much from the rain but my new Azalea we bought this spring was showing signs of dying from lack of water, so I soaked it good and will do so again tomorrow morning. The BES/rudbeckia "Goldstrum" have done exceedly well and they are starting to flop over, maybe from their height and beating rainfall. The liatris are finished blooming..do I cut them back to the ground? They will get dug up and moved in the Fall to front beds, where they will be seen more. I was thinking of going down to K-mart and buy some of those cheap metal fencing to hold up the BES/Rudbeckia. In the Fall, I will be cutting them back and digging some of them up and moving them too. Need to pinch the petunias back so they will bush out but they are wave petunias I think. Would pruning or pinching them back do them harm?

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Comments (2)

gardenfanatic2003
13 years ago
I'm not sure pruning the coreopsis to the ground was the best thing to do. Don't know about it growing back much this year since this is the hottest part of summer.

Cutting back wave petunias is the preferable thing to do when the blooms are spent or the plants are getting leggy. Cut them back so the stems are about 4 inches long to help them bulk up and look full (after they grow back). Fertilize them too, with a fert that's highest number is the middle one, and they'll grow right back and bloom some more.

Deanna
pippi21
Original Author
12 years ago
It's always good to have the ability to look back on previous post to get an idea when some garden task was done or concerns at that time. I noticed above post last August that I had sheared the Zagreb coreopsis back and I was hoping I hadn't ruined them. Well, here it is almost mid July a year later and I just sheared them back again and will be digging and dividing them again come Sept. I didn't cut them all the way to the ground this time; I did cut off quite a bit, at least half to get them under control and to deadhead them the easy way. The Zabreb and Moonbeam has so many buds, it is almost to deadhead them. You'd spent several hours each day deadheading them by hand. I don't have the patience or the time.

Deanna, what did you fertilize them with?(brand of product)Do you just scatter it about the root of the plants? I feed Miracle Gro..guess that's not enough? My intentions each year is to follow a 2 wk. cycle of using the MG but life happens and I fall short of those goals.

I may take some of this coreopsis when I dig it up and plant in a four inch pot for our upcoming plant swap in Sept. That is after I transplant what I want.
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Well this is most disappointing. I did see some pics on google that looked exactly like what I planted and they are listed as zone 7-9 which isn't even close to me. I feel like I got scammed. The nursery had them in with the perennials when I bought them (and I bought a lot of them). Perenniel in zone 7 is completely useless to me! UGH! Jackied...I had no idea they were that fussy about coming back (even when actually a perenniel in your zone). I was under the impression that coreopsis was invincible. At least my yellow clump came back. I really liked them because they flowered all season and let me abuse them. Thanks for the help!
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I've done coreopsis that way and the other day i did my cobbity daisies the same way.It doesn't hurt them and i always get reblooms,i even domy petunias that way.I have more plants than i have time,so i cut corners every way i can.Works for me. My opinion and remember it's just mine,is that some people stress too much over what to do in the garden.Mother nature doesn't stress and neither do i,and my plants and gardens look good,and that's not just my opinion,but friends and neighbors as well. Whatever works for you,do it!! There are no garden Police that i know of.Just sayin'. :) Kathi
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Coreopsis can be a finicky plant. Good drainage will always help for better success. Also, a lot of the heavy blooming perennials, according to Tracy DiSabato Aust, benefit by being allowed to rest closer to fall and winter. She recommends halting heavy deadheading procedures of long blooming perennials such as Gaillardia, Salvia, Gaura, etc as of late summer/fall (August/September) so as to give them better chances to save energy for the following season. Perhaps try that with the Coreopsis to improve situations.
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Squirrels sure do love freshly dug soil. Try sprinkling some dried blood down. Unfortunately, the more it rains or the more you water, the more you need to apply. Normally they do a number on my potted plants on the deck. The only ones they didn't touch were the ones topped off with commercial humus/manure...that stuff tends to get pretty hard, and they're staying away. I may be onto something here...
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