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As perennials, the foliage of Hostas dieback during the Winter and fresh growth appears in March the following year. The clumps become gradually larger and denser, as more eyes (shoots) appear each Spring.
Hostas enjoy moist fertile soil and dislike drying out, but as with all accent plants and bonsai in the confines of a small pot, the soil must be free draining. Repotting should be carried out every 2 to 3 years, preferably in March as the new growth starts to appear from the soil, however Hostas can be rootpruned and repotted successfully from November through to mid April in the UK.
To prune the roots (if necessary to fit into the pot), simply cut away the bottom 1/3 to 1/2 of the rootball with sharp scissors.
I have found that the best soil mix to use is:
2 parts peat compost, 2 parts horticultural grit and 1 part Akadama or Seramis.
In the absence of Akadama or Seramis use:
2 parts peat compost and 3 parts horticultural grit.
Never use compost without the addition of grit; in any small pot, compost (particularly those that are peat based) will become compacted, airless and difficult to water.
Hostas prefer a position in partial or full shade though they flower less in full shade. Yellow-leaved varieties colour better if given morning or evening sun.
Hostas are largely pest and disease free. When planted in the ground, Hostas often need protection from slug damage, however I have found that when grown in pots, slugs cease to be a problem.
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