That being said, hostas are very forgiving of being transplanted from spring to fall because their fleshy roots hold moisture. They will need more watering if moved during warm weather. In spring, once the leaves or eyes start poking through the soil, dig up the hosta plant and divide it into at least 1-foot diameter sections with a sharp spade or knife. Smaller hostas may be able to be divided just by teasing the roots apart by hand. The larger the division, the sooner the plants will fill in and flower.
Pests/ Disease: The two biggest pests of hosta are deer and slugs. Hosta has the nickname “deer lettuce” for a reason. Deer love the succulent, crunchy leaves. They are actually edible for humans, too, when the leaves are young.
To thwart deer, consider growing hosta in a protected space behind a fence. Erect the fence before the deer know hosta are there to eat, or they will try extra hard to jump the fence to get to their favorite dish. A seven-foot-tall fence may have to be erected around the garden to keep deer away in high-pressure areas.
The other option is repellent sprays. Rotate 2 to 3 different sprays containing active ingredients such as garlic, cayenne, rotten eggs and slaughterhouse waste. The different sprays will confuse the deer. Spray weekly during spring and summer to protect new foliage.
Slugs also love the conditions where hosta like to grow; cool and wet. If slugs and snails are big problems, don't mulch with bark (it provides a place for slugs and snails to hide) but try sharp stones, crushed shells, or raw sheep's wool. The wool has tannins and is scratchy. Both things slugs don't like.
Slugs traps using beer will work and organic baits with the active ingredient of iron phosphate has proven effective. Sprinkle the bait around plants and reapply after a heavy rain. The bait is safe for wildlife, pets and people, but the iron phosphate is toxic to slugs.
For hostas in containers or raised beds, place copper strips around the edge of the container or bed. Slugs and snails don't like crossing copper and will avoid the plants. Some varieties of hostas with thick leaves such as 'Sum and Substance' are less likely to be damaged by slugs.