with green. What is causing this.
There are a few things that can cause this, depending on how it appears, and where. Unfortunately your photo did not come through, though.
Most commonly, overwatering, pH imbalances, calcium, or magnesium deficiencies will be likely.
Test your soil nutrient content and pH. Amend accordingly.
Water, only, when the soil is dry COMPLETELY down to 2 inches or so, instead of daily.
Here are some articles that will help:
https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm
https://www.gardeningknowhow.com/ornamental/flowers/geranium/geranium-care.htm
My geraniums never look as full and lush as some others, what am I doing wrong? I take old flowers off and fertilize once a week with 20-20-20. What can I do?
It sounds like over fertilization. That is a very potent food, judging by the numbers, so adding too much will not be beneficial to the plant and will stunt growth.
This article will help you to care for geraniums, and know what and when to feed them: https://www.gardeningknowhow.com/ornamental/flowers/geranium/geranium-care.htm
I have a geranium that is citronella and I want to be able to save some seeds to start one year after year. Where are the seeds?
Geranium seeds aren't obvious, but they are there. First, do not deadhead the blossoms as you might normally do, but allow the blossoms to wilt. Watch for elongated, pointy pods that form underneath the bloom. These "cranesbill" pods contain seeds at the bottom of each pod, and are ripe when the pod turns from green to brown. Experts advise gently attaching a mesh bag around the stem to catch them as they drop, since they will eventually open up and fling their seeds to the wind. Once you've collected them, lay them out to dry and separate the seeds from the pods.
Here's an article about collecting flower seeds: https://www.gardeningknowhow.com/ornamental/flowers/fgen/harvesting-garden-seeds.htm and another that discusses how to store them: https://www.gardeningknowhow.com/garden-how-to/propagation/seeds/storing-seeds.htm
You also can start new plants by taking cuttings:
https://www.gardeningknowhow.com/ornamental/flowers/geranium/how-to-start-geranium-cuttings.htm
The leaves & tight flower buds are untouched but all the open flower petals are being eaten. I've been out at night with a torch but haven't found the culprit.
Unfortunately, it will be very hard to say what is eating them without catching the creature in the act. You could try pesticides for prevention, though. These articles will help:
https://www.gardeningknowhow.com/special/organic/what-are-organic-pesticides.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides
Unfortunately, your photo did not come through. I am unable to see the spot to identify the issue. In the meantime, these articles will help you to care for the plant, and test for deficiency and pH swings:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm
https://www.gardeningknowhow.com/ornamental/flowers/geranium/geranium-care.htm
You claim geraniums are cat safe, hence I nearly bought done, luckily I double checked, they are highly toxic and this information should be corrected https://www.aspca.org/pet-care/animal-poison-control/toxic-and-non-toxic-plants/geranium
Thank you for pointing out that error! It is being sent to the editors, now, for correction.
I have noticed holes in the leaves of my geranium. What should I do?
Unfortunately, your photos did not come through. I am unable to assess the damage. There are many things that can cause holes, from insects to infections.
You will want to treat with, either, an insecticide or a fungicide.
Here are some articles that will help:
https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm