Solidago- goldenrods, & Stylophorum in PNW

hemnancy(z8 PNW)January 12, 2013

I'm interested in Goldenrods this year, I've seen a lot of people on blogs saying good things about them, and while some spread with rhizomes and can be a little invasive, that appeals to me some since I have 2 acres and am constantly fighting weeds, especially annual grasses that get into my beds. I'm hoping for some good ground covering plants that can shade out the grasses. I would prefer to grow them from seed but if they would be too slow as seedlings and also not blooming until the second year, I'm tempted to buy plants. Has anyone succeeded well with Goldenrods the first year, and which varieties?

I'm also wondering if seed-grown plants must be babied the first winter or can be planted out.

I am also interested in Stylophorum diphyllum, a poppy that makes nice clumps, with the same considerations.

Any comments?

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Stylophorum diphyllum or wood poppy is a prolific seeder in our climate, but a nice woodland plant. Seedlings germinate on their own & are winter hardy. I don't know if it can shade out grasses since it prefers some shade & moisture.

The bright gold blooms really shine in the spring garden especially when combined with a blue flower like columbine or blue-eyed Mary since they both bloom at the same time. After that 1st flush of flowers has faded & the weather turned dry in July I cut it back hard. It regrows nice foliage & blooms again some, but not like in spring.

There is a orange flowering one that isn't as nice. I've read that the orange will eventually take over the yellow if you have both. The orange is a bit loud, but might suit you.

There is a taller wildflower poppy, Chelidonium majus with coarser leaves & smaller flowers. I like wildflowers, but this one is way to weedy. You don't want it.

At garden swaps often the 2 are switched, so you have to be careful. That is how I got each of them from 3 different sources. With a plant in back & front yards I'm set for life! It will just take one plant for you to get started or seeds.


Here is a link that might be useful: good photo

    Bookmark   January 15, 2013 at 3:13PM
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Make sure you are planting stylophorum and not Welsh poppy or Meconopsis cambrica. Welsh poppy, which comes in both yellow and orange flowered forms, is pretty much a weed. Seeds prolifically, grows well under a wide range of light and soil conditions and is extremely difficult to remove because of stubborn taproot. Stylophorum or celandine/wood poppy is present in only yellow flowers.

IME, Welsh poppy is not a clumper but grows more like other annual poppies like Papaver somniferum or Papaver rhoeas - tallish but narrow plants. Not at all very useful for shading out weeds or weedy grasses! The wood poppy is a much better choice for that but really needs a more shady location to flourish.

If growing either the solidagao or stylophorum from seed, I would recommed direct sowing. No babying required!

    Bookmark   January 16, 2013 at 3:09PM
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Are there 3 different yellow wood poppies or are two of these the same plant?

Meconopsis cambrica
Stylophorum diphyllum
Chelidonium majus

    Bookmark   January 17, 2013 at 1:51AM
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Embothrium(USDA 8 Sunset 5 WA)

They're all different.

The locally wild goldenrod does not show up that well in bloom. A garden form would probably be a better choice, maybe the bigeneric X Solidaster luteus as with that you get a bit more daisy-like individual flower head as well.

    Bookmark   January 19, 2013 at 4:34PM
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hemnancy(z8 PNW)

I'm getting some plants, named varieties, and also some Goldenrod seeds to try out. I'll let you know how they do. I'm somewhat afraid of the Goldenrods being eaten by deer so may have most behind fencing, but the ones from seed I will try in the open.


    Bookmark   January 29, 2013 at 7:48AM
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Deer haven't nubbled on Goldenrod Fireworks here. Seedlings are attractive to slugs like any other.

    Bookmark   January 29, 2013 at 3:16PM
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hemnancy(z8 PNW)

Thanks, Corrine, Solidago is on lists of plants deer don't bother much, but I've also seen websites that sound like deer may eat them in a pinch.

    Bookmark   February 5, 2013 at 3:39AM
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