At the last count, I had 32 hostas and most of these are in pots. Admittedly, some of these are miniatures, but nevertheless this means that in March a lot of checking and potting on needs to take place. My basic collection has increased over the years because people have given me hostas which they have bought and not had much luck with and then passed on to me. I am always grateful!
I check all pots to see whether root growth is coming through the bottom of the pot; where small enough I tip the plant out and check to see whether it is root-bound or the compost is looking a bit stale. However, Sum and Substance and Big Daddy are each about 4 feet tall and Big Daddy is in such a large pot it really needs two strong men to sort him out! Empress Wu is catching up with these guys in terms of size. I then use John Innes number 3 to pot up again. I try and leave a fair bit of space at the top of each pot to allow for the addition of a protective mulch. I make this with a mixture of farmyard manure and home made compost, which I keep as rough as possible with eggshells – this does a good job of discouraging slugs and snails while the plants are young and gives them a good head start. The coarser leaved hostas then tend to manage quite well thereafter. This year I have added a granular feed which should last 6 months. Many years ago I read somewhere that feeding hostas produces weaker growth, more susceptible to attack and I have never fed mine apart from the spring dose of compost, manure and sometimes bonemeal.
In my experience, the general gardening advice that the coarser the leaf the less likely a hosta is to be eaten by slugs and snails is true. Particularly resilient is Frances Williams and I can’t recommend this one enough. I also find Krossa Regal and Patriot very good. It’s also useful to think about where you are growing hostas. If they are crowded together in a border with lots of other plants, slugs and snails will still get to them no matter how many slug pellets you use. Snails can abseil down the leaf or stem of another plant to reach a hosta. As always in the garden, a consideration of the growing environment means there is less need to introduce artificial measures to control the pests.