Growing Interior Sandbar Willow (Salix interior) as a Houseplant?

I have been growing an Interior Sandbar Willow on a strong grow light since mid-September of last year when I started it from a cutting, and it now spans around 10 inches from the base to the tip of the longest stem. I really enjoy having it around and seeing it's rapid growth when it has the space to do so, but right now it seems to have taken up all of the room in its 6-inch pot. I would like to see it grow larger and give me more foliage, so what should my next pot's size be at a minimum? I am aware most willows grow very rapidly and probably would do best outside, but I don't have enough space for it in the yard. If anyone has experience with growing willows in pots and could give me advice, I'd really appreciate it!

I could imagine if the willow was happy you could make some cute interior willow structures.....

Have you tipped the willow out to check the root ball and it is looking root bound? I think generally the advice is not to pot on to too big a pot, so try and find one only an inch or so larger and deeper. However the willow will probably enjoy as much space and soil as you want to give it, so it probably doesn't matter if you want the plant to grow big quickly.
Willows respond well to cutting back - if you trim the long branch right back it will probably sprout multiple branches from lower down so making the plant more bushy. You might be able to root the bit you cut off as well if you want.

Sounds good, I'll check the bottom to see if it is bound or not. Would it be beneficial to fertilize them as well due to the constraints with growing in a pot? I've got lots of vermicompost I'm not using that I could apply.

Jamie Desmonds wrote:Would it be beneficial to fertilize them as well due to the constraints with growing in a pot? I've got lots of vermicompost I'm not using that I could apply.

I would say yes. Either as a top dressing, or a teaspoon mixed in when you water it. It looks pretty healthy at present, so you don't want to over do it either - that can also lead to pest problems.