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If you are having growth at the bottom, this indicates stress to the remaining portions of the plant, but it is still alive. You may need to just prune it all the way back (don't worry these plants are very resilient). Also, you may need to feed it with a balanced fertilizer to encourage growth and flowering. Here is more information that may be helpful: https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-blooming-problems.htm, https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-no-leaves.htm

You do not need both for this plant to bloom. Even if there was either a male or female plant, it would still flower without the aid of the other. These plants are notorious for non-blooming issues. Here is an article that you may find helpful: https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-blooming-problems.htm

These plants are notorious for non-blooming issues. Here is an article that you may find helpful: https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-blooming-problems.htm

This article should help: https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-no-leaves.htm

First of all, many fertilizers do not come with an expiration date, so this can make it diffcult to know how long it will keep. Generally, its effectiveness will depend on what the product is made of (i.e. liquid, powder, granules, etc.), whether it's derived from organic compounds or chemicals, and how it has been stored. Since blood meal is organic and if it's been kept dry, it should still be ok to use on the plants. Now as to how effective it will be, I do not know, but it will not harm the plants. As for the non-blooming of wisteria and iris plants, you may need more phosphorus in the soil, of which bone meal can help.

If you notice beautiful purple blooms prior to foliage growth, then you probably have a Chinese wisteria. This type forms flower buds on previous year’s wood. Therefore, it commonly blooms before the plant actually leafs out. Japanese wisteria blooms after the plant has sprouted leaves.