mandevilla question

marricgardensOctober 21, 2011

I don't know if I'm on the right forum or not. I've tried growing them before but mine just dried up and died. Now I have seen one that was trained into a standard and would like to try my hand at that. I think my sunroom may have been to dry and that was partly why it dried up. Any mandevilla experts out there? Any advice? Marg

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pirate_girl(Zone7 NYC)

Aren't they a kind of Orchid? If so, I'd try the Orchid Forum. If not, than I'm sorry, I don't know the plant in question.

    Bookmark   October 21, 2011 at 1:38PM
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Tiffany, purpleinopp GardenWeb, Z8b Opp, AL(8B AL)

Formerly known as Dipladenia. It will likely go dormant (and become easy to overwater in that state.) Maybe your plant was just dormant. The first few I threw out years ago had live-looking roots, and at the time I didn't know tropical plants could be deciduous and figured it was dead if all the leaves fell off.

    Bookmark   October 21, 2011 at 4:14PM
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tapla (mid-MI z5b-6a)

I've grown them in containers & don't even try to keep them pushing growth over winter. I leave them outdoors until it freezes & they lose their leaves, then bring them into a cool basement where they snooze away the winter. I only give them enough water to keep roots from drying completely. In spring, when increasing day length tells them to wake up, I cut the bottom half of the root mass off, bare root what's left & cut the fat roots out of that, then repot into a fast-draining, well-aerated soil, and fertilize when they start to show signs of wanting to grow in earnest.


    Bookmark   October 21, 2011 at 4:40PM
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Purpleinopp: the stalk on mine was dried and brown. The roots weren't healthy looking either so I thought it was dead. Didn't realize they went dormant, I'll have to remember that.

tapla: I don't have a basement but I could leave it in our unheated porch. It doesn't go below freezing in there.

Thanks for the advice. Marg

    Bookmark   October 21, 2011 at 7:32PM
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paul_(z5 MI)

No definitely not an orchid, Pirate girl. I think you were thinking of Masdevallia.

IME, they are not easy plants to keep growing over the winter, and they are very prone to spidermites and mealie bugs. Al's suggestion is the best way to go. Your porch may work. Cut the sucker back hard and let it get quite dry -- chilly wet soil will rot the roots out.

    Bookmark   October 28, 2011 at 8:00PM
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