I generally store bare rooted even if placed in a tub., and in full sun (as much as I can get them) in the conservatory or Lunar Module. All are in full light. Paper is put in the bottom of pots/tubs to help absorb water, and needs changing every few weeks, as becomes soggy. I do leave some smaller ones in pots, but as they are all in full light they will try to grow all the time there is enough water. Leaves dying off is a sign that it has become dry enough.
Below is my data on the conditions Ensete grow in naturally, and IMO the best way to overwinter is to induce a drought domancy. I've added comments on some of the problems I have had and others such as Will Giles, have told me.
Ensete are high altitude tropical plants, apart from green venstricosum. and are subjected to cold nights with possibly a degree or two of frost.
Natural winter conditions
- Coldest nights to just below freezing
- Days heat up to between 10 and 30C in the coldest month.
- A dry season with 2 to 8 months of little, or no rain.
- The coldest months are in the dry season,
- The dry season is very sunny, 8/9 hrs a day,
- Sun altitude lowest 63°(equivalent to summer solstice in Cornwall)
- Humidity gets as low as 10%.
They have evolved to go dormant when the dry season kicks in, and start to grow again either when there is rain, or the humidity level rises a short while before the wet season starts.
Compare that to what we are trying to do
Winter Storing
Storing in the dark is only something you can do successfully if the Ensete has been induced into dormancy, and that happens due to drought, not cold.
-Leaving a large Ensete in a tub without water may take 4 to 5 months to completely dry out, if in high humidity. Even then.....
- The pseudostem is 98% water and gives up some of this stored water into the compost, keeping it wetter for longer
- The compost may look bone dry on the surface, but may be soggy in the centre of the pot.
- NEVER pot into something with no drainage for winter.
- If you must risk potting overwinter use a substrate that does not absorb water ie bark chips, grit, gravel etc. and NEVER peat or ground bark.
- light is no problem if water is withheld as is natural dormancy
Keeping Growing
- If you intend to keep growing the temperature needs to rise to at least 10C but be cool at night
- Give as much light and full sun as possible.
- Keep compost virtually dry
- Don't feed, as it does not grow properly over the darkest months.