Overwintering Alstroemeria (Peruvian Lily) in Missouri: Pot It, Don't Plant It

Alstroemeria—those gorgeous, streaked, lily-like blooms—are tempting to plant in the ground, but in Missouri (Zone 5b–6a), they won't survive winter outdoors. The solution? Grow them as container plants and overwinter them dormant in a cool, protected space.

Why Not In-Ground?

Alstroemeria tubers are hardy only to about Zone 7 (0°F / -18°C). Missouri winters regularly dip well below that. Even with heavy mulch, survival is unreliable.

Container Strategy for Year-Round Success

Spring–Summer (Active Growth)

• Plant in a large pot (12–14"+ diameter) with rich, well-drained potting mix.
• Place in full sun to part shade; water consistently—moist but not soggy.
• Feed monthly with balanced fertilizer (10-10-10) during active growth.

Fall (Pre-Dormancy)

• After first frost kills top growth, cut stems back to 2–3 inches.
• Move pot to an unheated garage, basement, or cold frame (35–45°F ideal).
• Keep dark and dry; water only when soil is bone-dry (once a month max).

Spring (Reawakening)

• After last frost, move to a shaded spot for 7 days to acclimate.
• Then transition to full sun; resume regular watering and feeding.
• Repot every 2–3 years or divide tubers to refresh vigor.

Bonus: Why Pots Can Be Better

Container-grown alstroemeria often bloom longer and cleaner than in-ground plants, since you control soil quality, drainage, and root temperature. Plus, you can move them to center stage when in bloom.

Treat it like a tender perennial—pot, protect, and enjoy those exotic blooms for years.