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It is important, here, to understand the life cycle of these plants. They are biennials, meaning the first year will focus on leaf growth, and the second year will be flowering and seeding.

Pruning them at any time will disturb the natural cycle of the plant. The height is controlled, mostly, by genetics, but they can get slightly taller when there is not quite enough light. I would not recommend pruning, unless you are removing dead flowers, which can give you a little extra life from the plant if you are in a warmer climate.

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The flowers don't require removal, or deadheading, to continue blooming, but pruning off the old flowers does improve the plant's appearance. Deadheading can also prevent hollyhocks from unwanted self-sowing so they don't spread to nearby garden beds.

Pinch off any blossoms from the main stem that have begun to fade to improve the appearance of the plant. Leave the stalk in place so the remaining buds can open and flower fully. Check the hollyhocks every one to two days once the flower stalks are blooming and remove dead flowers.

Cut off the entire flower stalk at the base after 70 percent or more of the flowers have finished blooming. Use sharp shears to remove the flower stalk.

Dispose of the deadheaded stalks immediately. Stalks left in the garden bed may harbor disease organisms that can spread to the plant.

Cut down the entire plant in fall after it dies back. Remove all parts of the plant from the area.
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Hollyhocks appreciate full sun. Here is an article on care: https://www.gardeningknowhow.com/ornamental/flowers/hollyhock/tips-on-hollyhocks-growing-hollyhocks-successfully.htm

This will be a fungal infection present in the soil. Usually hollyhocks are short lived, and within a couple of years, new seedlings have grown into mature plants again. Treating the plant itself is not of much use.

You can treat the soil, however. Use DOLOMITIC LIME and WETTABLE SULFUR according to all packaging instructions to treat the area. This will help kill off anything lurking in the soil, as well as condition it back to a proper state.

This article will help you with the care of hollyhocks: https://www.gardeningknowhow.com/ornamental/flowers/hollyhock/tips-on-hollyhocks-growing-hollyhocks-successfully.htm