Fothergilla not growing well
I have a fothergilla mt. airy located in a raised bed, clay soil, full sun until late afternoon. It may be a dryish spot because it gets no supplemental watering unless I remember. I did that atleast once a week several weeks this summer due to the heat wave. It has been in that spot for alteast 18 months now and has grown very little. It has filled out a bit but put on barely any height. I really needed something taller in that particular spot.
I know fothergilla's grow slowly but this has hardly put on any height at all. Is there any reason to think it will speed up growth as it gets more established? Is the lack of supplemental watering a problem? I have boxwoods and weigela's nearby doing just fine.