Yes, you can grow a small grapevine in an outdoor plant box! While grapevines are typically grown in large gardens or vineyards, compact varieties thrive in containers with proper care. Choose a dwarf or patio grapevine variety, such as 'Pixie' or 'Boskoop Glory,' which are well-suited for confined spaces.

Ensure your plant box is at least 15-20 gallons in size and has excellent drainage. Grapevines need full sunlight (6-8 hours daily) and well-draining soil. Use a sturdy trellis or support system to guide growth vertically, saving space. Water deeply but infrequently, allowing the soil to dry slightly between sessions.

Prune annually to maintain shape and encourage fruit production. With the right conditions, your outdoor plant box can yield sweet, homegrown grapes in just a few seasons!