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planter box

noun

  1. a container, typically a rectangular or square structure, used to grow plants in a controlled environment, often outdoors
L1450312 on Wikidata ↗

Wiktionary

noun

  1. A flower box; an object that contains live flowers, usually affixed outside, just below a window.

    1897, Hon. Stuart Brown, “Indian Corn—Its Cultivation and Uses”, read before the Sangamon County Farmers Institute, in Charles F. Mills (ed.), Annual Report, Illinois Farmer’s Institute, with Reports of County Farmers’ Institutes, for the Year 1897, Phillips Bros., page 115, Cross fertilization has generally given greater yields. It is done by planting with one variety in one planter box and another variety in the other.