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How big is it? What size pot did you get?

“I just planted . . . “. New plantings usually require patience. Give it two seasons to grow roots, settle in, and then start filling in branches. These are plants that can be pruned for shape, but when newly planted they need all their leaves to photosynthesize and provide the energy needed in order to grow roots and more branches. If you can live with a somewhat leggy look for a couple of seasons, you can then prune them for shape early spring the third season and you will see them fill in well. If you prune them sooner you will likely set them back in terms of achieving good size and shape.

Schnikel

On 1st year plantings, either stake the stems with blooms or just cut off the bloom - depending on stem strength. I like to give the 1st and even 2nd year plantings stems a chance to grow strong without snapping/bending/breaking.

Leave them alone this year and maybe next year too if very small when planted.

After that pruning promotes a bushier plant as 2 stems form below where you made the cut.

Thus when you do prune cut each stem back by 1/2 late winter early spring. this should promote a bushier and less leggy plant.

I planted 11 of them (somewhat leggy and imbalanced form) last year. I hard pruned them down to 8”-12” above ground in the winter and they are in bushy 5’x5’ form now. I don’t think they minded the pruning, or at least in my case.