How do I determine the size and shape for an urn/pot for topiary?

There are all kinds of rules for the size of pots for plants, but for a decorative look and decorative urns, it is all a matter of what you like. Get the size that looks good to you!

Being a nurse has nothing to do with it. You have a nobel profession, now we need to unleash your creative side.

As you stated proportion and scale make a huge difference.

Let's try this. How big are the urns you purchased? How tall and circumference? Too small I am guessing?

Since this is a church, I am going out on a limb here and guess it has a grand or sizable entrance with lots of space to fill.

Yes, the urns are too small I think. Maybe 24” tall and maybe a 14” diameter. I can’t give exact measurements right now. And yes the church has 3 double doors and hence the 4 topiaries between the doors. Thank you both for your help.

1/3 to 1/4 the size of topiary and no bigger/wider in diameter than the base of the topiary, add a brick or 2 in bottom to stabilize it so it won't tip. If it an actual footed urn make sure it's heavy on bottom if it's hollow or plastic it will need to be weighted in foot also or it will tip easily especially in the slightest wind. If your set on using footed urns then topiaries really need cement urns as used in classic topiary gardens.

Hi Robbie. I'm Cindy. You're right, 14" is too small for such a large topiary. I recommend at least twice that size. That will work in proportion with such a big lobby, and will create the drama you want. The height of 24" sounds OK. Because each topiary is so large, I would put floral foam in each urn. Simply wet it and stick the topiary in it. You can hide it by putting artificial moss on top of it. Using it will help secure each one down. Hope this helps you. Good luck from Cindy.