I have a small bamboo trellis in the pot with my mandevilla. All I do is guide the young vines counterclockwise one half turn or so around one of the legs. I believe they are strongly oriented to go only one way -- mine always goes counterclockwise. If you just start them on their way, they will clasp and climb. The vines grow more woody as they mature, so you need to work with the very green tips. Mine are flexible to about 18 inches. You could use a very soft, loose tie, but the tips are easily damaged, so you need to be gentle. You might need to move the bamboo stick closer to the pot.

I do give mine a wee bit of help, rather depends on what I want it to go up on. Thunbergia though as stated above will find it's way up anything it can twine around. Depending on what I want the vine on, I use a combination of little pea sticks and fishing line as I do for morning glories for my picket fence. If you're wanting to put it in front of say a privacy type fence you'd have to give it something to twine on. I use a black webbing (totally disappears) to get some annual vine coverage on a few areas of my privacy fence. I use little twisters that are clear plastic covered wires to very loose tie in place as things get started depending on what vine. Never tie tightly though you want nothing that will damage the vine and you have to remember the vine will be getting thicker as it grows.

Hi Paul, As you can see, there are different ways to do this. I doubt there's a 'best' way, more like personal preference. I myself use wire coat hangers, opened up & bent into whatever shape I want, often I use a U-shape & place it upside down in the pot, training the vine. Others I've done around circular wire hoop (pegged down into the mix). Then I affix the vines w/ various things, twister ties from bread bags, I use binder clips for the heavier Hoyas, some folks I know use pipe cleaners. One just needs to take take not to tie it too tightly lest it strangle the vine. I've also seen folks use plain old orchid clips.

Barbara, Is it a chicken wire type frame? Is it an upright rosemary? If so, I start trimming it while it is a small plant inside the frame so it will branch out better within the frame. It may take months to fill it in depending on the size of the frame and the plant. I think if you were to let it grow out of the frame and THEN trim it, you end up with a bare middle.