I live in Victoria and would like to build a large container on a second floor deck that will hold three "star jasmine" vines.
This weekend we picked up three:
Trachelospermum jasminoides japonicum "star Jasmine", with grower tag stating adult height 6'-8'. (Clearview Horticultural Products Inc.)
The purpose for this planting is to provide evergreen privacy screening for a deck railing 14' long by 4' high. This height may eventually be increased to 5'.
I'm hoping you may have suggestions regarding a few concerns that will help these vines in the long run, and avoid root pruning if possible.
The container will be situated in the middle section of the span with vines trained along horizontal wires. Also I realize that considerable structural reinforcing will be needed below the deck.
Anyway I was wondering...
- What size container would be ideal to hold three of these vines, and is a depth of 18" sufficient? This is a long term set-up and I hope to avoid root pruning if possible.
- I'm concerned about winter freezing of the root mass. The cedar box will have a fiberglass liner, so the cedar will be more decorative. Is it a possibility to include 1" blue foam sheet in the box construction, or does the whole box have to be covered with something each winter?
- What type of wire should I use for training the vine on? I thought of copper as this may be good outside, as far as corrosion, but will it harm the vine?
Thank-you for all your help,