I noticed on medical site where you input you height, they have one box for feet and one for inches. Like this one for BMI calculator.
You could do this for each of the Max. Height, Min. Height, Max. and Spread. If the plants max. height is eight feet they would enter an 8 in the feet box and 0 in the inches or it could be left blank. If it is eight and a half feet they would enter 8 in the feet and 6 in the inches. Repeat that for minimum height and spread.
