It has almost rust-like markings on the leaves each year. Other hosta growing next to it do not have this problem?
It sounds like your plant is getting a rust fungus. This article will help:
The one Hosta plant I have potted on my deck comes out every spring a beautiful green and white but a couple of months later is always turns a faded white and green. How do I stop this?
What type of light does the plant receive? A variegated plant usually needs less sunlight and must be placed in an area with filtered bright sunlight. Variegated leaves can burn or lose color if placed in direct sunlight.
I have a hosta that is suddenly dying. The leaves are turning brown at the tips, moving inward, and there is a sticky substance on the underside of leaves.
Your hosta may have a pest of some kind, likely aphids or a similar sap-sucking insect. The sticky substance is the honeydew left behind from their feeding. Wash the plant down good and then treat it with neem oil, which is effective against these types of insect pests.
Deer ate my hosta leaves. Should I cut them back and start over or leave them?
Yes, as long as the roots are still intact, the plants should be fine. However, to help alleviate future issues with deer, you may need to add some deterrents to the area. These articles will help: https://www.gardeningknowhow.com/plant-problems/pests/deer/deer-repellents.htm
Leave them as they are. They should come up again in the spring as long as the deer didn't dig up the roots.
Should I cut the flower stems from my hostas after flowers are done?
Yes, you can remove the flower stems. This will not hurt the plant.
This past spring we moved to a different house and I brought along differentt varieties of Hosta. The soil here is all sand. When I transplanted them, I added black dirt to the soil. They get half sun and half shade during the summer months. The variegated variety and the yellow and green variety turned all green. Why is that and will fertilizing them help?
This article has information about why this happens and what you can do: https://www.gardeningknowhow.com/plant-problems/environmental/variegated-plant-problems.htm
The deer ate my recently planted hostas (almost to ground level). Will the hosta produce new foliage this summer?
Yes, as long as the crowns/roots are not damaged, the plants will regrow. Here is information to help with the deer: https://www.gardeningknowhow.com/plant-problems/pests/deer/deer-repellents.htm