Got a Gap

60s today, cool and partly sunny.
Isn't this pot of violas beautiful?

There's a gap in the Birch Garden where the gaura is slowly coming in... but I think I'll take it out.  It's too slow showing up and just leaves a big hole there as everything else fills in.  What to put in there??

You can see what a big bushy filler it was late in the season last year.  Photos from May 31 last year show it had filled in and was getting bigger... not so this year.

A lot of dark purple in the early May Birch garden: