we love hostas-but-do you have an invasive one?

hostaLes(5)June 3, 2012

I don't have one thatI feel is invasive yet, so I can't post a photo. Will Stiletto be?

I'd added one last year. And H. clausa is listed as stoloniferous. Can mine become invasive?

H. clausa var. normalis

Do you have any hostas that you wish you hadn't added because they have become invasive?

Les

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ken_adrian Adrian MI cold Z5

my clausa squared ... clausa var clausa is about 8 by 8 FEET ...

has swallowed 6 or 8 surrounding hosta ...

and has the most glorious pink and purple flowers

ken

    Bookmark   June 3, 2012 at 8:37AM
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hostaLes(5)

sounds like I can replace one of my Lancifolia floats with clausa. I really love the deep purple flowers, and there are a lot of them.

Les

    Bookmark   June 3, 2012 at 9:40AM
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alyciaadamo(3/4)

Undulata! It seems that every landscape that my family came in to contact with had an undulata and it came to me! In my front bed are 8 undulata(but these came from my dead Aunts' house and thankfully they are the good looking ones with three colors) and now that my dad moved to our area he gave me 5 more (not so good looking undulatas plain green and white). I guess this isn't the same though, huh?! ;) I just can't wait til I can "gift" them to someone else!

    Bookmark   June 3, 2012 at 9:57AM
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Pieter zone 7/8 B.C.

Les,

Here's a H. clausa var. normalis root from last year. Yes, it was potted, thank goodness, but this gives you an idea of how rhizomatous it can be and how quickly and widely it potentially can spread.

Pieter

    Bookmark   June 3, 2012 at 11:46AM
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hostaLes(5)

Would you rather have clausa spec. normalis (see blossoms in 1st photo) or vinca minor as a ground cover?

Les

    Bookmark   June 3, 2012 at 12:05PM
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eleanorb190

I consider August Moon kind of in the "invasive" category in my yard because it is such a fast increaser that I can't keep up with how often it needs to be split so it won't swallow up the hostas next to it. I have it in multiple places because I use it to "tie together" the landscape. When I split it(which is like digging in cement), I plant one with 2-3 eyes and plenty of room between it and the next plant, and two years later it has S P R E A D to 20 eyes and swallowing up everything again! It absolutely thrives on neglect, too! I have given clumps of it to my sister to feed the deer. However, I would NOT consider completely getting rid of it or sorry I got it.

    Bookmark   June 3, 2012 at 1:59PM
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anniegolden(z7a)

'Rhizomatous'. Such an education I'm getting. Now I have to figure out what good it does to be old and smart.
Christine

    Bookmark   June 3, 2012 at 5:13PM
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Steve Massachusetts Zone 5b

Rhizomes are modified stems that run underground, allowing the plant (i.e. H. Clausa) to reproduce itself asexually. Stolons are modified stems that do the same thing but they run above ground. I'm pretty sure that H. Clausa is rhizomatus not stoloniferous.

Steve

    Bookmark   June 3, 2012 at 5:36PM
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hostaLes(5)

I aagree. I couldn't remember which when I did my research on it. Strangely, when I was reading about clausa var. normalis, nothing was included about spreading undergreound (beyond the crown increasing in size) but under clausa var. clausa, I think which doesn't flower, it is mentioned. The other variety of clausa (can't remember the var.) has flowers but they don't open and it is also mentioned it is rhizomatus. So I assumed normalis is also. Steve-help with the three variations please.

Les

    Bookmark   June 3, 2012 at 7:17PM
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Steve Massachusetts Zone 5b

Pieter is much more knowledgeable about H. clausa than I am. I don't grow it. This is from the Library.

clausa is a Korean species known in Japan as Tsubomi Giboshi, meaning "closed flower ball ( = bud) hosta." It is also known under the name clausa var. clausa. It occurs in central and northern Korea and is the form with closed flowers. According to Schmid, plants with this form are very rare in the wild. It and clausa var. normalis are basically the same species, although the former is a sterile triploid and the later a fertile diploid.

Steve

    Bookmark   June 3, 2012 at 7:43PM
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gardenfanatic(MO zone5b)

Ken, you should send a photo of that to the Hosta Library!

Deanna

    Bookmark   June 3, 2012 at 8:08PM
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idiothe(4 MN)

I've never met a hosta I'd call invasive as I find them relatively easy to chop back if they are rhizomatous. I do have two that are particularly apt to form disorganized colonies rather than neat clumps... kikutii yakusimensis and Otome No Ka

    Bookmark   June 3, 2012 at 10:47PM
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Pieter zone 7/8 B.C.

There are 5 subspecies of clausa, you will find 4 of them in this PDF on the HL and the 5th one is here. I received my original plant as a NOID a number of years ago and initially I thought it might have had 'Lancifolia' on my hands, but the flowers ultimately ended up clinching it. And man, they're purple them flowers! Love 'em!

Pieter

    Bookmark   June 3, 2012 at 11:32PM
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hosta_freak(z6 NC)

My Clausa spreads pretty well,but it is in an area where it doesn't affect any other hostas. I put it there years ago,to make a ground cover. Stiletto spreads,but I would hardly call it invasive. I kinda like the way it spreads. Phil

    Bookmark   June 4, 2012 at 12:58PM
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hostaLes(5)

Pieter, thanks for your response. I had to laugh because it read just as I would have written mine, confusion with Lancifolia and all. I'd decided mine is H.v. normalis because the flowers open. But now I think I might have your 5th sub-species.
You can decide.

If clausa is normally considered invasibe, I would gladly invade my whole mulberry jungle with it and let it do its thing. (LOL) I love the dense and vivid flowers.

Les

    Bookmark   June 4, 2012 at 1:43PM
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hostaLes(5)

Could you post a picture of your spread (pref. in bloom), and maybe a close-up of your clausa hosta freak?

Les

    Bookmark   June 4, 2012 at 1:47PM
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hostahillbilly(4)

Yellow Splash Rim ! It's in a lot of sun and has a weeping hose buried past it, and I have to carve it to pot up for others every spring.

Better that than the alternative, huh??

hh

    Bookmark   June 6, 2012 at 11:34PM
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