Reviving a Stagnant Potted Lemon Tree: Repot, Feed, and Light

Why It "Went to Sleep"

A 6-inch pot is far too small for an 18-inch lemon tree. Roots are circling, nutrients exhausted, and indoor winter conditions (low light, 20–30% humidity) induced semi-dormancy.

Step-by-Step Recovery

1. Repot now: 10–12 inch pot, citrus potting mix (add perlite/bark for drainage).
2. Acclimate to outdoors: When nights >50°F, move to shade for 1 week, then partial sun, then full sun. Prevents sunburn.
3. Fertilize: High-nitrogen citrus fertilizer (e.g., 10-5-10 with micronutrients) monthly during active growth. Acidifying formulas help maintain pH 6–6.5.
4. Water: Thorough soak; let top 2 inches dry. Never let sit in saucer water.
5. Humidity: Mist daily or use humidifier indoors (target 50–60% RH).

Expected Timeline

• 2–3 weeks: New root growth.
• 4–6 weeks: Vigorous shoot elongation.
• Next bloom cycle: Flowers and fruit set if light >6 hrs direct sun.

Wisconsin growers succeed with this exact regimen. Your tree isn't broken—just cramped.