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There are only two things that are absolutely safe to put in your hummingbird feeders: white sugar and water. Adding anything other than white sugar and water could put their health at risk.

Here is an article on how to attract hummingbirds to your garden:
https://www.gardeningknowhow.com/garden-how-to/beneficial/attracting-hummingbirds.htm

If you sowed seeds, then germination generally takes place within 14-21 days. Since it has been much longer than this, it could be that the seeds were either no good or they were planted too deep. Hollyhock seeds need only be sown no more than 1/4 inch deep.

However, if you actually planted a bare root hollyhock, these should be planted no more than 2 inches deep. They should be showing signs of growth by now, provided the ground temps have sufficiently warmed. I would give it another couple weeks or so, and maybe even a dose of fertilizer to give it a boost. If you still don't see any growth by then, it is probably safe to say that they're not going to.

Any fungicide available at a garden center or nursery will be adequate.
Follow the directions on the container.

Here is a great article.

https://www.gardeningknowhow.com/ornamental/flowers/hollyhock/tips-on-hollyhocks-growing-hollyhocks-successfully.htm

You could try using Bt or neem oil to get rid of the worms. Here is more information:
https://extension.colostate.edu/pubs/insect/05556.html
https://www.gardeningknowhow.com/problems/pests/neem-oil-uses.htm

The soil may be lacking phosphorus, which is necessary for blooming. Use a phosphorus-rich fertilizer or add bone meal to the soil around your plants and see of this helps.

In cooler regions like yours, hollyhocks are normally treated as annuals, though they can reseed and come back just fine. To be on the safe side, I would collect some seeds for replanting. For additional information on over wintering these plants, this article should help: http://voices.yahoo.com/how-winter-over-hollyhocks-garden-10365315.html