When do I prune hydrangeas?
Right after they bloom! (and that applies to all types of blooming hydrangeas)
Any later will decrease or even prevent next year's blooms.
I have had a hydrangea for about five years. It came from a cutting my friend gave me. The mother plant it came from always blooms. I gave one of the cuttings to my friend, and she has had blooms every year. Mine, however, is barren, except for lovely the green leaves. I have it in a protected location, with morning sun, afternoon shade. I feed regularly with hydrangea food. I did take a cutting from it last year, put it in my veggie patch, and it flowered. I am speechless; have you any suggestions?
If a cutting from the plant produced blooms in another location, then the location is the issue. Judging from your comment that the leaves look beautiful, there is probably too much nitrogen in the soil where it is located. This causes lush foliage growth and no blossoms. Have the soil tested and start to use a phosphorous rich fertilizer for a few months.
I live in Canberra where most things die back in the winter. I have a very healthy hydrangea and I would enjoy taking some cuttings of this bush for potting and planting out later this year. Can you oblige?
This article will help you: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/hydrangea-propagation.htm
Is Hydrangea paniculata 'Vanilla Fraise' suitable for a small garden? Can it be pruned?
At full maturity it gets to be about 6 feet wide, but that being said, hydrangeas are not usually rapid growers. You can prune it back to keep it smaller.
I have a rather large hydrangea, an old tall rose bush, and a new low and bushy rose bush. They all get western sun. I would like to move them all to either a south or southeastern exposure. Can this be done? The tall bush is right in front of my house. It sends up long canes, which are almost dangerous and really not all that attractive. What should I do?
You run the risk of losing the plants when are large, as larger plants are more susceptible to transplant shock. I would recommend taking cuttings, regardless if you move them or not. That way if they die when moved, you will still have their offspring to plant. This article will help with that: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/hydrangea-propagation.htm
Moving an old rose bush is tricky and you may need to cut it back. They are very susceptible to transplant shock. But, these articles will help: https://www.gardeningknowhow.com/ornamental/flowers/roses/transplanting-roses.htm
Also, you will want to start cuttings, just in case it does not make it. This article will help with that: https://aggie-horticulture.tamu.edu/southerngarden/roseprop.html
How often does hydrangea need to be watered, and what planting zone does it thrive in?
They need about 2 inches of water a week, either from rainfall or the hose. As far as where they thrive, that depends on what variety you plan on growing. If you tell us the variety, we can tell you how cold tolerant it is.
My hydrangeas are not as bright blue as they use to be. Why?
I suspect that either the aluminum in the soil is getting low or the pH in the soil is going up and they are beginning to fade into the pink side. This article will help you regain their color: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/change-hydrangea-color.htm