Helianthus maximiliani - Invasive?
greengardener07
14 years ago
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coolplantsguy
14 years agodandy_line (Z3b N Cent Mn)
14 years agoRelated Discussions
Limiting Helianthus Spread in the Border
Comments (0)This spring, I planted what I'm pretty sure is Helianthus maximiliani. I left what I thought was plenty of room because I expected the plant to spread a little. It's now wanting to take over the neighborhood. I'm considering how to confine it to a limited area, and hoping that some of you have experience doing that. How deep would edging need to be to reliably contain the runners? A few years ago, I tried to contain Equisetum hyemale with edging (ok, stop laughing, I'm trying to be serious here). I don't want to repeat that episode. Also, does anyone have recommendations on what type of edging is best? My Helianthus is planted near the crest of a berm, so the contour of the bed is not flat. I've read reviews on a few different "pound-in" edgers, that described installation as "like trying to pound pieces of cardboard into the ground". I need something that will actually work....See MoreHelp! Uber-Helianthus maximiliani
Comments (9)In the 6 years I've had Max Sunflowers I've not had 1 self-sown seedling...the Gold Finches usually get at them before I cut them down for the winter. As far as spread...the more water the faster the spread. Actually I've never seen any offshoots from rhizomes...unless they are really short (unlike Monarda) and close to the main clump. My clumps just get a little bigger each year but not by much. I like mine shorter and bushier rather than taller and give them a wack back to about (in a rounded fashion) when they reach about 3' tall and then again after about 4 weeks. Otherwise I can't stand the overly tall stems falling every witch way and it will with the kinda winds we get. I do the same thing to my Hollyhocks (just one cutback once the flowering stems begin shooting up) that grow in and near by beds :)...See MoreMonster helianthus
Comments (5)Yes definitely, I pinch my Helianthus 'Lemon Queen' in June along with other large perennials like Aster and Solidago. This tends to make them shorter and bushier, and does seem to delay bloom time somewhat. I just got a division of Helianthus maximiliani at plant swap this Spring which is supposed to grow huge and bloom late in the season. I definitely plan to whack it back next year!...See MoreHave Helianthus angustifolius
Comments (1)Would love to trade for some. I have alot of variegated "Hidden Lily," (Curcuma "The Emperor.") Also some great daylilies, crocosmia, etc. I live on The Islands....See Morewantonamara Z8 CenTex
14 years agoSweet Sakura
14 years agogreengardener07
14 years agoflowersong
5 years ago
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