All my Hellebores have this sticky and these white whatever they are. Please advise what it is and how to get rid of these.
Hellebores are generally not too susceptible to bug infestation. It's a little hard to tell from the photo but I would suspect aphids. However, mealybugs can sometimes be a problem.
So here are a couple of articles that address both aphid and mealybug issues on hellebores:
https://www.gardeningknowhow.com/ornamental/flowers/hellebore/hellebore-plant-problems.htm
https://www.gardeningknowhow.com/plant-problems/pests/insects/mealybugs-control.htm
These plants have bloomed right on cue for the last ten Christmases. This summer they decided to bloom again at the end of June, not a time for any hellebores to bloom. The flowers were a little smaller than normal, and didn't hang on as long either. I am in zone 6b. This June was a little wet, but just enough for the other plants to due very well, with a few coming in and blooming a little on the early side. Nothing extreme. I'd love to understand why this happened, and if it will affect the plant's blooming this coming Christmas.
This can happen with cooler weather after a hot spell. This is not usual, and will not happen often. To ensure that it will bloom, reliably, this Winter I would remove the flower growth at this time.
Otherwise, this article will offer some tips on their care:
https://www.gardeningknowhow.com/ornamental/flowers/hellebore/growing-hellebores.htm
I have 3 hellebores growing in mostly shade, with some dappled light. I have had them for approximately 3 years. I purchased one gallon potted plants.
Unfortunately, not all strains of Helleborus produce babies, and some produce very few. If they have not done so by now, they may not. The ones I grew didn't increase the clump for two or three years then suddenly it was huge.
https://www.gardeningknowhow.com/ornamental/flowers/hellebore/pruning-hellebore-plants.htm
https://www.gardeningknowhow.com/ornamental/flowers/hellebore/hellebore-plant-propagation.htm
how many different types are there?
Here's a great website from the University of Delaware with photos and details:
https://cdn.canr.udel.edu/wp-content/uploads/sites/16/2019/04/02213433/2019_Helleborus_Lenten_Rose_Feature.pdf
Here is our article that provides details about how to grow them: https://www.gardeningknowhow.com/ornamental/flowers/hellebore/growing-hellebores.htm
I am planning to plant HELLEBORES in my shady garden. Do you think it is too late to plant them now? Will they survive winter if planted mid-January? Thank you very much.
Yes, it's late (or early). Even though they are late winter/early spring bloomers, planting now doesn't give their roots time to get established before harsh weather. I would hold them over till spring.
I feel like they are droopy immediately after they bloom (I know it’s normal for them to droop after a while). This year and last they did this. I know barely anything about them, and the previous owner of the house planted them- not sure when. We’ve had a very warm and wet winter. They bloomed this year about 3-4 weeks ago.
As you mentioned, some droopiness is normal for these plants. If your soil is well-draining and your plants are getting plenty of water, you may want to examine them for other problems. It sounds as though they are healthy and blooming, and they are probably fine. But, check to be sure they aren't sitting in pooled water, and use this article to check for other possible problems:
https://www.gardeningknowhow.com/ornamental/flowers/hellebore/hellebore-plant-problems.htm
Think this is on your double hellebore website would like name and where to buy please.
That is similar to the photo on our article page about double hellebores but our photo was purchased from a stock photo service so we do not know where the flower originated. Also, we don't make vendor recommendations.
You can find such flowers at your local nursery or garden center or from reputable online nurseries. Good luck!