I have moonflower vines too. Most of the time they only open about halfway, but last night one opened pretty much completely. I don't know what makes the difference but I do know that mine usually only open about halfway. And mine NEVER set seed so I guess in that aspect you're lucky.

Thanks for the reply. Maybe it is normal for them to open that way? The ones I had last year opened really fast as you watched them and they also opened really wide, like dinner plates. BTW, I see my first post went through eventually. I also posted "Trying this again."

I started my Moonflowers from seed this year also. They didn't really come into full bloom until about a month ago. Mine open fully and each one has produced a seed pod but it's not going to be warm here long enough for most of them to mature. As long as I get a couple ripe pods I'll be happy. The vines get so big that I only grow a few a year anyway.
Karyn

My moonflowers never bloomed,:( , not giving up though. Will try again next year.

micki,
Do you fertilize them? I know that if they have too much fertilizer, they won't bloom but will just put on a lot of green growth. I think the same goes for morning glories. Good luck next year...try cutting back on fertilizing.

my pink moon vine did not bloom until the second year and it has tons of blooms, i guess to make up for last year..
gloria_j

The different species of Morning Glory related moonvines include species that variably annuals and perennials...

Ipomoea alba and Ipomoea turbinata are usually annuals,but may act like short lived perennials in the warmest areas of the US...Ipomoea macrorhiza is a perennial and like other true perennials may take several years before it blooms...

There are also additional species of moonvines in the Morning Glory Family in addition to the species mentioned above including Ipomoea albivenia...

TTY,...

Ron

Here is a link that might be useful: Another thread on plants in the MG family and the effects of various nutrients

I grew my moonflowers in containers this year and they did well but very few seed pods were ripe by the time our temps dropped. The plants lost all their leaves and buds but I decided to take one in to see if the seeds would ripen before they froze outside. The darn thing started growing again and is putting out flowers in the house! It takes up an awful lot of space and is creeping everywhere but it looks so pretty that I think I'll let it keep growing. It would be nice if it continues to grow throughout the winter and I can put it back outside next spring and not have to wait until late summer for blooms. Is that possible? I don't know what variety it is, just a regular moonflower with big white blooms.

karyn...I think that's awesome! You must have it near a bright window because they need lots of sun to grow and flower. I might give this a try now. I was going to last year but I didn't bother because I thought it wouldn't last indoors with not enough sun. Thanks.

Gardeniarose I actually have it (and many other plants) under a 1000 watt MH bulb. I think those HID lights will make anything grow!