We have had them for about 3 years and this year only one bush has one flower. Do they need something?
Your hydrangeas probably just need a rest. It's commmon for these plants, the 'old-fashioned' varieties at least, to flower heavily for a year or two and then rest for a season. If you didn't have a late frost that would damage the forming buds, I suspect that's the answer. If the problem continues, you'll need to see if they're getting as much light as they used to.
Why are my hydrangea leaves turning yellow?
It may be a lack of water. These plants do prefer moist soil and if it has been very dry where you live, this could be the cause of the problem.
This article will have some other possibilities:
https://www.gardeningknowhow.com/plant-problems/environmental/plant-leaves-turn-yellow.htm
How do you get a hydrangea to change color, maybe blue to red?
This article will help:
http://www.gardeningknowhow.com/flower/change-hydrangea-color.htm
For past 2 years my hydrangea has white sticky dots on its lower stems. Last year only 3 very large flowers. This year all hydrangea bloomed with beautiful flowers, but it still has the white sticky dots.
It sounds like aphids. I would recommend treating the plant with neem oil. These articles will help:
https://www.gardeningknowhow.com/plant-problems/pests/homemade-aphid-control-a-natural-way-to-kill-aphids.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
My 3-year-old hydrangeas produced many blooms in mid-June. They are nicely formed in the morning, but by noon they are very droopy with the individual flower petals separating. They do this even after being watered in the morning. I have fed with Muracid in fall and early spring and then added aluminum sulfate to get blue flowers. Is there another feeding vehicle to make hardier blossoms? Thanks, R
You may want to try increasing their water. They may need 2 waterings a day, instead of 1 or the one in the morning needs to be longer, especially if the temps have been high.
Hydrangea are meant to be shade or part shade plants. If yours is out in full sun, it is going to need more water support to keep from wilting halfway through the day.
If you still feel that water is not the issue, check the roots. It is possible that it has root rot, which is affecting its ability to take water up and thus it wilts like it is not getting enough water.
I have a large white hydrangea plant that is very healthy. I give it Hollytone for acid and fertilizer annually. I've tried planting copper pennies by the roots to see if the flowers will turn colors. Is there any surefire way of getting this hydrangea to turn blue or pink? This white plant that I have does have different leaves from a smaller blue hydrangea that I have on the other side of the house. Possibly I have a white variety that can only have white blossoms.
Your hydrangea isn't going to change. White hydrangeas aren't dependent on soil acidity for their color. Sorry.
I have a hydrangea that was planted a little over a month ago. A couple of the branches are drooping. The others are fine. It's had plenty of water, so that's not the problem. What causes the drooping? What should I do?
It is likely transplant shock. This article will help with that:
https://www.gardeningknowhow.com/plant-problems/environmental/learn-how-to-avoid-and-repair-transplant-shock-in-plants.htm
You may want to just give it a bit more water. If it is getting a little more sun than the others, it may need additional water to get itself established.