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You can! Hibiscus propagate easily from seed. I can only recommend looking to your local garden center, or online. There are many places online that can send you just about any seed to anyone. Just do a search, and find the best option for you.

Here is an article with some information: https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/hibiscus-propagation.htm

If you are transplanting into a pot from the ground, the recipes for hibiscus potting soil in these articles will help you:
https://extension.missouri.edu/adair/hibiscus.aspx
https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/hibiscus-container-care.htm

Avoid fertilizing in the winter, but you can add fertilizer in the spring.

Not to worry. I have a very easy remedy to your problem. This is my personal recipe, and is very effective at controlling a large number of insect pests, fungal issues, and deficiencies. It is best to use all ingredients listed, but if you can't get them, it will still work. It is just most effective with all of its parts. The method is as follows:

First, you will want to prime the soil with dolomitic lime, then spread wettable sulfur to Kill off any infection in the soil. I Also like to spray the plant itself. Mix a few drops of one or more of these ingredients into warm water with a spoonful of coconut oil: Rosemary oil, lavender oil, neem oil, garlic oil, cinnamon extract/oil and for really bad cases, also add clove oil.

Here is an article for more information:https://www.gardeningknowhow.com/special/organic/natural-home-pesticides-organic-garden-pest-control.htm

Unfortunately, it could be either, as both can give the same symptoms. It could also be a bigger issue, such as rot. I recommend putting dolomitic lime, and wettable sulfur powder. This will bring your pH back to normal. Both of these together, along with proper watering will ensure its survival.Keep the area moist, but not wet or dry. Just in between. Let the soil dry out in the top two inches in between waterings.

Here is an article with some tips on growing hibiscus: https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/how-to-care-for-hibiscus-plants.htm

It sounds like it they may be getting too much feeding. I would recommend feeding only once per month. It may be that there is salt build up occurring in the soil. I would also add dolomitic lime, as this will control the pH since the soil is likely fluctuating with feedings. Make sure to keep it watered very well with the clay soil around, as this tends to soak up water like a sponge once it finally makes it into the ground.

Here is an article for more tips on caring for hibiscus: https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/how-to-care-for-hibiscus-plants.htm

This could, very well, be due to there being too much nitrogen in the soil. Make sure the container, or area is well draining and flush with extra water, being sure that they do not sit in water. Adding a fertilizer with, both potassium and phosphorus can help in some cases. There is a product called tomato set spray that you can get to enhance flowering but it is somewhat toxic so you would have to make sure you wash you hands. It won't last on the plants very long, but it will increase the number of blooms. I have often found that potassium oxide, which you can get at many websites, will stimulate VERY fast plant growth and flowering at the cost of being somewhat expensive.

Here is a link some articles of all of the information you could need for the hibiscus: https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/