We've had a lot of rain and little sunshine for the last 3 weeks.
The excessive water and less then the ideal 6 to 8 hours of sun most likely is the issue.
You can remove the yellowing leaves.
Make sure your pots or containers are well draining so the plant is not sitting in soggy soil.
Here is a link.
https://www.gardeningknowhow.com/ornamental/flowers/geranium/geranium-care.htm
Too wet? Too dry? Too much sun?
All of the above, could be possible reasons.
Hot temperatures can cause the leaves to curl up. The warmer temps will require more frequent watering, so make sure you are checking the soil. A well draining soil and pot is very important.
If you can move the pots to a location that is out of direct sun, that should help your plant weather the summer temperatures with less stress.
Here is a link about geranium care.
https://www.gardeningknowhow.com/ornamental/flowers/geranium/geranium-care.htm
What causes red veins in the leaves of geraniums?
It is likely due to a nutrient imbalance, though watering with cold water, cooler air temperatures and keeping the soil too wet could also be causes. A soil test wold confirm any deficiencies so they can be corrected.
I bought 2 geraniums starts that were marked new variety of scented geranium. I did not keep the information. I planted them in large pots that get sun until late afternoon. They are growing very well and filling the pot. But, they are not getting blooms. What am I doing wrong?
Scented Geraniums or Pelargoniums are one of my favorite plants.
The blossoms are much smaller on these plants, so you will only see little clusters of these delicate flowers.
The plants highly fragrant leaves are their best feature!
Here is a great link to help you learn about your new plants.
https://www.gardeningknowhow.com/edible/herbs/scented-geranium/scented-geranium-care.htm
I have two potted outdoor geraniums that have browning leaves, even the new leaves. What to do?
Are they receiving enough water? Keeping potted plants watered well in the warm summer temperatures is very important to there health.
Check the soil and water well, make sure the soil and pot are well draining.
Here are a few great articles.
https://www.gardeningknowhow.com/plant-problems/environmental/heat-stress-plants.htm
https://www.gardeningknowhow.com/ornamental/flowers/geranium/geranium-yellow-leaves.htm
https://www.gardeningknowhow.com/ornamental/flowers/geranium/geranium-care.htm
Why does only part of the buds on my geranium open? The buds that are on the bottom don't. I have kept some over them for a couple of years or longer.
This can happen for a few reasons. Over fertilization or soil that is too wet can cause this as can too little light. It may also be botrytis fungus. Check to make sure that the geraniums are in an optimal location with well draining soil and, if you fertilize, stop for awhile. If you don't see an improvement, treat the plant with a fungicide to treat the botrytis fungus.
If oil/soap mix cannot be used on waxy leaf (ivy geranium) or hairy leaf (rose geranium), what can be made up to use? I've used neem, but I'd like to get a remedy to use instead that is easy to prepare and apply.
Neem oil is the most effective treatment we have found for scale insects. It is actually quite easy to use. Simply mix with water per label instructions and apply as a foliar spray.