Hello,

I have two questions, so I figured I would put them both in the same thread.

My first question is about the leaf curl that this viburnum is exhibiting. Is this a response to too much light?

The new growth appears normal, but the older growth is mostly rolled up (leaf edges curled downwards).

This is (I believe) a Burkwood viburnum which rooted this summer. I am growing it indoors over winter with the hope that it will be large enough to plant out this spring. It is receiving lots of light - a (very) rough estimate/calculation is 1000 PPFD from a 4200k ceramic metal halide, for 16 hours/day which should produce a DLI of around 58.

It is growing in the 511 mix, and since there is no worry about extreme temperatures I am using Dynamite All-Purpose 15-5-9 controlled release fertilizer. The air temperature stays between 68° and 72° F, and the root zone stays above 65° (seems to be consistently near 70°, perhaps warming from the black plastic containers?). Humidity is controlled with a humidifier and humidistat and stays between 50% and 65%. Air flow is present and not excessive.

So why the leaf curl? I have read that Burkwood viburnums do well in full sun. I also have a chile pepper plant, a dwarf butterfly bush, and a viburnum opulus 'Roseum' growing in the same conditions, and the only evidence of stress on any of the plants is this leaf curl on the Burkwood viburnum.

My second question is, is there any worry about "skipping" a winter for these three shrubs? They were rooted this summer, and stayed indoors. I am actively growing them indoors this winter, avoiding a dormant period, and plan to plant them outside after last frost in the spring. They will then have a full growing season before their first winter/dormancy period. Will this long period of growth harm them? I know some plants need a regular dormant period or else they can weaken.

Thanks!