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I know just the thing. This is my recipe for a broad range of insects, fungus, and other pests. It is safe for the plants, animals, and people in the area, and you can use it at any time as often as you wish. You may skip the soil priming, but it is always good to do just to make sure the soil is clean, and performing at its best. If you do not have all of the ingredients for the spray, it will still work. The more you have the better, and more effective it is. The recipe 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 with other good remedies:https://www.gardeningknowhow.com/special/organic/natural-home-pesticides-organic-garden-pest-control.htm

Yes, but the seed needs special preparation or it will take months or years to germinate. Here is the process. https://www.gardeningknowhow.com/ornamental/bulbs/canna/planting-canna-lily-seeds.htm

That is correct. after the frost hits the tops, then you can dig them out. Here is an article for more information: https://www.gardeningknowhow.com/ornamental/bulbs/canna/storing-canna-bulbs.htm

Some cannas won't flower if the bulbs didn't store enough energy the year before. In that case they will probably flower next year. The amount of light may also be a problem- cannas ideally need 6 hours of light or more. Cannas should be ok in acid soil unless it is very-acid, so you might want to test the pH after the hydrangea fertilizer is added.

Small dangling roots can be left on. If there are so many roots they won't fit in your container, they can be trimmed off, but don't damage the main bulb. The bulbs should be individually wrapped to promote air flow and prevent rotting.

When the flowers on one flower spike have died, you can "deadhead" or cut the spike just below the flowers. This will promote additional flower production. The green spiky ball is the canna seed pod. You can cut it off to promote more flowering. Or, you can wait for it to mature, then save the seeds for future planting:

https://www.gardeningknowhow.com/ornamental/bulbs/canna/planting-canna-lily-seeds.htm