Black Bamboo

[malana3]

I have planted, into troughs, two Black Bamboos ( phyllostachys nigra) which I am keen to ensure will survive the coming winter. They were planted into potting compost and appear to be thriving and growing well, currently about two metres high. It is understood that this plant will grow in poor soil so would they benefit from a top up of well rotted manure or could this make the soil too rich? Also, how much protection will they need from frost. The troughs are steel lined with butyl, in a reasonably sheltered position. All advice will be welcome, thanks in advance.

[Chipchopper]

If, as you say you've planted them in potting compost, I would imagine that fertilizer has already been added to the compost and adding extra nutrients may cause them to become too rampant.

Some horticultural fleece or a deep mulch of bark chips around the base of the stems, should help with extra winter protection.

I think they may eventually double in height.