Decision.

Ok, every pot's lowest row is ten stitches wide so this is how I'll do it: 10+24+24+(1+)1=(60)59.

Nasty part in this is that I've to frog that damn frame completely and re-stitch it, but on the other hand... only one frame to frog though.

Other option is to shrink frame width to 58 stitches, but I'm not sure would it look good with wider topiaries. Better to have some space around them.

Pattern notes.

Winter and summer are centered correctly. Spring and autumn aren't.

So, either I've to frog that frame completely and re-stitch it or just live with it. I think I'll stitch that topiary before I decide what I do. Maybe it looks good even it's not centered - anyway, I've done it just the way it should be done.