When you mention that your seed pods are fuzzy that got me wondering. I would normally describe holly hock seeds as disc shaped almost like they are layered. I provided a site below that has alcea, hollyhock seed pod, seeds, and seedling. You will find the hollyhock in the second column. When you sow them is up to you but no you do not have to sow them now. Storage is simple, a properly dried seed can be stored in many ways. To dry the seed I would lay them flat on an open surface, on a paper towel or a paper plate. Layering them singly. I would probably allow them to dry a few days to a week maybe even 2. Once they are dry then you can store them how you want. Some store their seeds in the fridge some just use an envelope and put in a drawer. As long as the seeds are not stored in constant temperature fluctuations and not in extreme heat I think you should be ok. If you are going to plant them soon it is not like you should store them in the fridge or freezer. Though if you do not plan to use them for about 5 years I may say toss them in the fridge or freezer (I usually have more room in my freezer) once they are completely dry. My rule of thumb when planting any seed, is to plant as deep as it is wide. Seeds like poppy or other tiny seeds I do not even bother to cover those. I just toss and press. I hope that helps!!

Thought I would add a picture of the bloom from this hibiscus. Let me know if interested in a trade.

I will like to exchange hibiscus rosa sinensis hybrid seeds (from Andalucia, Spain), for modern hibiscus cuttings.

I also have hybrid seed, perhaps we could exchange seed until my young plants are suitable to take cuttings from. I have a large selection (about 30 varieties of 'garden hibiscus') but my 'American' sort are still young plants only purchased during the last half year or so. Tylene and Byron Metts have flowered, Germ Geller is about to, but the flowers are bigger than the plants so for the moment cuttings of this sort of variety is impossible. For your information there are at least three suppliers of the new hybrid hibiscus in Europe. I have plants from two of them. You may be interested in going to the forum on www.infojardin.com and the subsection 'Hibiscus' which is very active and has lots of photos.