In 7b I imagine it'll be a while before you can guarantee no frosts, so it's too soon to think of planting Nasturtiums outside.

As for climbing, they really just scramble. If you give them a net, or even just the existing lattice, they'll probably set off up it. But they might need a bit of help with some weaving and tying in of stems. They are not self clinging.

Not all nasturtiums are the same :-) 'Moonlight' is described as a "vigorous 6 foot trailer" so more likely to be encouraged to climb - with guidance - than more compact or mounding cultivars.

That's the thing I was thinking floral. I don't remember them having tendrils or wrapping... I'm more excited to learn something new. They're welcome in the garden whether they climb or not.

Though, in the picture, it seems like they sort of tie them on the trellis? Do you see what I see gardengal or floral? Not that I would mind doing that.

They would need to be tied OR the long extending stems carefully woven through the trellis or netting.

I don't see ties. I just see stems and some blue trellis. I have not grown this cultivar but I have trailing Nasturtiums which self sow every year and they will scramble up over anything in their way.

In the upper left hand portion of the picture, the stems seems to coalesce. Doesn't look fully natural? But maybe it is. I have often put them in pots where they trail, or front of the border and they spread. Happy to try something new 😃

I'm not seeing any coalescence. I've clicked the image for clarity and zoomed it. I have a very clear image. What device are you using?

I think it looks like someone grabbed as many stems as possible, and tied them on. Which I can do, but not naturally growing that way. Whatever it is, I am still going to try it.

That bunching of upright stems looks like the natural growth habit to me. But tying them in a little wouldn't hurt. Rouge's pic show how they tend to scramble up suitable things rather than actively climb like beans or honeysuckle.

I'm ready! I put up a net so they could ramble up it. We'll see 😊. There are more than half a dozen plants along it. So it will be a mass of blooms one way or another.