From the images you sent here, I can see 3 different things going on.

With your hydrangea, this is a leaftier moth, you can read more about them here:

https://www.uvm.edu/news/extension/hydrangea-leaftier

https://bygl.osu.edu/node/1979

"This minor pest causes no real damage to the overall health of the bush, so no pesticides are warranted. Plus, the little caterpillars are very protected within their shelter so contact insecticides would be of no use. You could handpick the structures if they are unsightly or mechanically squish the pest before it pupates."

With your phlox, this looks like four-lined plant bug damage. This pest is a generalist and can feed on many different types of plants. They can be tricky to deal with when they're are lots of them. Here's how to manage them in your garden:

1. Check for bugs

Look for insects or their damage in late May and early June. The sooner they are detected, the sooner they can be managed, which helps reduce plant injury. Look carefully as bugs may drop to the ground or hide when disturbed.

Small to moderate numbers of fourlined plant bugs do not seriously harm plants. Usually, treatment is not necessary to protect the plant health.

2. Remove damaged plants in the fall.

Cut down host plants in the fall to remove eggs that may have been inserted into them. Be sure to bury or compost removed plant material or remove plant residues from the landscape area. *this is key to not allowing populations to build up in your garden

3. Consider spraying

Insecticidal soap can be effective against nymphs (less so against adults). Pyrethrins can also be effective. Both products must directly contact the insects to kill them. Neither product has any residual activity so repeat treatments may be needed. Insecticidal soap and pyrethrin are generally low risk to beneficial insects.

If you find high numbers of fourlined plant bugs, there are a variety of long lasting insecticides to consider. Use them carefully as they can kill a variety of insects, including natural enemies.

Examples of contact residual insecticides are: bifenthrin, cyfluthrin, lambda-cyhalothrin, and permethrin."

https://extension.umn.edu/yard-and-garden-insects/four-lined-plant-bugs

For your rose, it's a little hard to tell what my be responsible for the stunted growth and puckered leaves, but I would image this is from aphids feeding on the plant. They do not seem to still be present, but the damage they cause can look like this as the plant grows out. I do see the start of what looks like black spot which is a common fungal pathogen of roses.

Here are some recommended management strategies:

"Look for and plant disease-resistant roses. Rose cultivars resistant to black spot are increasingly more available, but resistance can be regionally variable.

*Sanitation is critical for black spot management. Removal of fallen leaves and pruning infected canes will dramatically slow initial spring infections.

*Good air circulation will reduce the incidence of black spot by promoting faster drying of leaf surfaces.

*Restrict irrigation during cloudy, humid weather.

If you do not have a resistant cultivar, many people will need to use labeled fungicide sprays every 7-14 days as the first leaves emerge in the spring through the fall for adequate control of this disease. It is best to spray before a rain event to protect the leaves and to alternate types of fungicides."

https://extension.umd.edu/resource/black-spot-disease-roses/

https://extension.umd.edu/resource/rose-identify-and-manage-problems/