Since they are climbers and you are in zone 6a, it would be best to keep it in a container to be brought indoors to overwinter, this will prevent damage to the root system.
Here are some very sturdy ideas for trellis from Pinterest:
Unless you want to wheel this in and outside every year just grow it indoors. I thought I would move my jasmine in and out every year but I didn't think about how much it would weigh. Moved it once. Too heavy.
Hi Ellen, I would go for a metal trellis and preferably one that's stable since you'll have to move it inside. A box or pyramid shape would work really well and you'll need to add wheels on the planter to save your back.
My research shows that it is designed for climbing on trellises. I'm surprised you have it in 6a since it's a heat and drought tolerant plant. I'm not sure how well it will do in the winter. They cannot withstand temperatures below freezing, they need to be brought in if you have severe temperatures.. They also need full sun and shelter from the wind. The soil is best when sandy (50/50 sand & soil).
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A metal trellis would give it the most support. Since it's not native to your climate, here's a link with some growing tips for you:
https://www.chicagotribune.com/news/ct-xpm-2006-01-29-0601290364-story.html
Since they are climbers and you are in zone 6a, it would be best to keep it in a container to be brought indoors to overwinter, this will prevent damage to the root system.
Here are some very sturdy ideas for trellis from Pinterest:
https://www.pinterest.com/claudiaobrien33/bougainvillea-trellis/
Unless you want to wheel this in and outside every year just grow it indoors. I thought I would move my jasmine in and out every year but I didn't think about how much it would weigh. Moved it once. Too heavy.
How to Grow Bougainvillea Indoorshttps://www.thespruce.com/grow-bougainvillea-inside-1902743
Hi Ellen, I would go for a metal trellis and preferably one that's stable since you'll have to move it inside. A box or pyramid shape would work really well and you'll need to add wheels on the planter to save your back.
here is info for you - this is a tropical plant so the winters in your area would kill the plant so bring it inside
https://www.chicagotribune.com/news/ct-xpm-2006-01-29-0601290364-story.html
you can use a piece of vinyl lattice for support or you can buy supports at any hardware or garden center
Easy and affordable DIY Trellis Install - Jenna Sue Design ...
https://www.jennasuedesign.com/2019/07/easy-and-affordable-diy-trellis-install
Chicken wire , Galvanized square wire. Plastic Trellis, Wooden framed Trellis. All fixed to walls with hooks and eyes.
My research shows that it is designed for climbing on trellises. I'm surprised you have it in 6a since it's a heat and drought tolerant plant. I'm not sure how well it will do in the winter. They cannot withstand temperatures below freezing, they need to be brought in if you have severe temperatures.. They also need full sun and shelter from the wind. The soil is best when sandy (50/50 sand & soil).
heres a vid that will help you out
How to Train Bougainvillea : Great Gardening - YouTube
I personally suggest to make use of a metal trellis to ensure its stability.