planterful

noun2

1. •
   As much as fits in a planter.

   • Give me only three planterfuls." — 1887
2. •
   A quantity (of something) in a planter.

   • Since mint spreads underground runners, it's soon all over a terrace box. A damp, semishaded hanging planterful will be plenty for summer drinks and salad herbing. — 1975