Well established endless summer hydrangea is progressively wilting. What’s happening?
It can be hard to determine what caused the wilt. I do have a question... Are those rocks placed on top of the soil that it is buried in, or are they planted just in the rocks? If they are not in actual soil, then it is likely drying out VERY fast. These will need quite a bit of water in regular soil, as they dry out. If they are only in rocks, then this might have to be irrigated constantly on dry days.
if this is properly in the soil, and only covered with rocks, then it could very well be a fungal infection. You can attempt to correct this with dolomitic lime and wettable sulfur.
I was given this hydrangea last autumn it was very healthy with lots of flowers it was in a glass porch from early november until May any advice please ?
This is a macrophylla, or large leaf hydrangea. There is a major issue going on with that plant, though. That purple on the margins is not good at all. Here are two articles that will help: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/hydrangea-leaves-turn-purple.htm
https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/prune-hydrangea-bushes-hydrangea-pruning-instructions.htm
https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/mophead-hydrangea-care.htm
Do you cut (deadhead) spent blossoms or leave them alone
These articles will help you.
https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/deadheading-a-hydrangea.htm
https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/prune-hydrangea-bushes-hydrangea-pruning-instructions.htm
I have a Hydrangea Quercifolia 'Snow Queen' that gets filtered sunlight from a large oak and very little direct sunlight. The soil is somewhat sandy. I drip irrigate. Fertilize somewhat regularly. The plant is about 5 feet tall and leggy but healthy although the leafs are not dark green. The plan lives in a cool coastal climate zone. Problem is I am not getting any blossoms and have not for the past two years since it was planted. Question: What can I do to promote flower growth?
Partial sun is needed and many times lack of flowering is due to sunlight and over fertilizing. You can have your soil tested to see if you have too much nitrogen. Too much nitrogen will cause you to have lovely foliage and not flowers.
https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/hydrangea-not-blooming.htm
I would like to give a friend a Hydrangea whose house is just 40 feet from salt water and a lot of wind and faces south.
Hydrangea macrophylla (bigleaf) is salt spray and full sun tolerant. The Endless Summer and Everlasting Revolution hybrids sound like good matches for your friend's conditions. If you ever travel along Long Beach Island, you will see many, many hydrangeas.
What size pot do you use to root hydrangeas? Thanks
If you are rooting cuttings from this plant, you can root these in any size container. The larger the container, the longer it can stay in that size, but it also comes with a risk of being overwatered and getting an infection. It will be up to you what size you choose for rooting.
I have a "Strawberry Vanilla" and "Pinky Winky" hydrangea. Are these cut back like the "Endless Summer" hydrangeas?
Strawberry Vanilla is Hydrangea Paniculata, as is Pinky Winky. This article will give you information on how to care for these: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/tree-hydrangea-growing.htm