I bought 2 Dipladenia plants from Home Depot and they had quite a few excellent blooms on them. After the initial blooms came off, none have appeared since. I have watered and give them plant food about every 2 weeks. I have not trimmed them back, and vines are climbing and look healthy. For them to bloom again, do I need to trim them back? I am hoping to eventually attract hummingbirds.
They require very specific conditions to bloom. These two articles will help: https://www.gardeningknowhow.com/ornamental/vines/mandevilla/growing-a-dipladenia.htm
It has lots of buds but they die before they open. What's wrong with the plant?
They are very sensitive to conditions. Kind of a picky plant. These articles will help you out: https://www.gardeningknowhow.com/ornamental/vines/mandevilla/growing-a-dipladenia.htm
I live in Port Chester, NY 10573 I know that leaving the plants out during the winter would kill them. They are currently all planted in large pots I would like to know your opinion on the following procedure; 1. Put them up against the house that faces South. This will give more exposure to the sun and shield them from the wind and snow. 2. Trim them and cover with 55 gal. black plastic garbage bags. Please get back to me and let me know. If you find the above works I will plan on planting more of them next spring. Thanks in advance, Anthony Treglia 14 Davenport Ave Port Chester, NY 10573 firstname.lastname@example.org
I don't think this will work. Mandevilla is fully hardy in zone 9 and warmer. You might be able to coax a plant hardy in zone 7 through a NY winter but even that is iffy. One issue is being in a container and therefore having the entire rootball subject to air temps. All plants in containers should be treated as though they are in one zone colder than your actual hardiness zone. Black plastic will cook the plant on sunny days and encourage fungus but not protect the plant from freezing temps. Remember this plant can't take any frost. Your best bet is to borrow a dolly and haul it indoors. Here is an article that explains over-wintering mandevilla indoors: https://www.gardeningknowhow.com/ornamental/vines/mandevilla/winterizing-mandevillas.htm
Saw them at my neighbours
They can, and will eat a wide variety of plants. This article will help you to control them: https://www.gardeningknowhow.com/plant-problems/pests/insects/japanese-beetles.htm
Will Japanese beetles eat dipladenia? I saw some at my neighbours and was thinking of them in lieu of four o'clocks.
They are not picky. They will eat, absolutely, anything. They have preferences for certain plants and trees but nothing is safe.
Good insect control practices will do wonders here.
These articles will help: https://www.gardeningknowhow.com/special/organic/what-are-organic-pesticides.htm
I realize that I must move them indoors over the winter. I will move them into my garage and provide lighting.
They are not hardy in your area. Dipladenia should not lose their leaves, as they are an evergreen. This will mean that they have gotten a little too cold. Sometimes they can recover, but they don't tolerate the cold well.
The best thing from here will be to slow WAY down on care, watering, and anything that you do to it at all until it recovers. Trying to help it once it is stressed to this point will usually kill it, but letting it recover without messing with it much will be the best way to let it recover.
This article will help you with the care of these indoors: https://www.gardeningknowhow.com/ornamental/vines/mandevilla/growing-a-dipladenia.htm
They are growing fine now in my UNheated porch, but I know it can't be kept all winter.
This article outlines the temperature and growing requirements for your dipladenia and should help you decide whether bringing it indoors will work for you.