I grow three. The 'hardy' banana Musa basjoo; the red abyssinian banana Ensete ventricosum 'Maurelii'; and the Chinese dwarf banana, Musella lasiocarpa. All were new last year, replacements for older plants I lost over the previous two winters. All three have survived last winter. With protection. I've learned a good deal since my more optimistic exotic gardening days of a few years ago. Fortunately, all three are readily and cheaply available as summer bedding plants thanks to tissue culture propagation techniques so replacement wasn't too painful. Even so, they'll be far larger and do far better in their second year so successful overwintering is a definite bonus
Musa basjoo spent last summer in a large pot. I only bought it in July so it didn't really have a chance to get going before autumn and then winter slowed growth. We had one bad week in early February when I had to provide some in situ protection but it has stayed outside all winter long. I find that the fleshy stems will take about -5 or -6C before terminally succumbing to frost though well established clumps can regenerate from the roots after even lower temperatures. For ultimate height, though, you do need to protect the stems from year to year. I never did with my old clump and the 2009-2010 winter finished it off. Though not before it got to this size:
|Musa basjoo towers over Dicksonia antarctica summer 2007|
Now I'm starting again. So it was a relief to lop the dry, blackened top third of my single stemmed plant to reveal an intact growing point. Two weeks later and growth is evident.
|New roller developing on Musa basjoo|
Ensete ventricosum 'Maurelii' must be one of the most spectacular perennials that can be grown in cool temperate climates. Even as a young plant it oozes exotica. This was mine after four months growth last year:
|Ensete ventricosum 'Maurelii', Autumn 2011|
Overwintering consisted of digging up the plant with a small rootball, draining off the water that collects in the leaf bases by inverting it for a couple of days and then standing it upright in a tiny pot in the corner of my little shade house. When the weather got frosty I moved it inside - then out again when conditions eased. Here's the pot. It's only for support.
|Ensete ventricosum 'Maurelii' in its overwintering pot|
Growth is astonishingly fast. It's now too big for the spot I had it last year - but I've got another spot picked out. Not in shade this time.
The final one of my bananas is Musella lasiocarpa. Again, I've grown it before and lost it to the unexpected harsh winter of 2009 - 2010. So I couldn't resist a very cut price end of season specimen in one of my local DIY sheds last Autumn. This overwintered unprotected and is now sprouting again. No pictures of this one yet - but I'll take some in the summer when I expect it to be an interesting part of my display.