Crassula (Summer Type) 🌿

📊 Botanical Profile

• Key Traits: Often shrub-like or forming structured rosettes. Leaves are characteristically thick, opposite, and highly water-retentive. Many develop woody stems over time.

• Habitat: Native to arid and semi-arid regions, often found in rocky, well-draining soils.

• Note: Includes classic houseplants like the Jade Tree (C. ovata). Growth form varies widely—from ground covers to small trees.

☀️ Light & Temperature

• Ideal Light (Indoor): PPFD 150–400 (≈ 12–35k lux).

• Ideal Light (Acclimated Outdoor): PPFD 400–800 (≈ 30–70k lux).

• Stretching Warning: PPFD < 120 sustained for 2+ weeks.

• Sunburn Risk: PPFD > 700 on unacclimated plants + stagnant air.

• Best Growth: 15–28°C.

• Tolerance: Can handle brief dips to 0–5°C if absolutely dry. Tolerates heat up to 35–38°C with excellent airflow.

• Summer Rhythm: Growth is most active in warmth. Provide 6-10 hours of bright light with good ventilation. Use shading during extreme heatwaves.

💧 Watering & Substrate

• The Golden Rule: Soak & Dry Completely. Water thoroughly, then allow the substrate to dry 100% before even considering more water. Verify with a weight check or dry skewer.

• Perfect Soil Mix: 60–90% inorganic grit (pumice, perlite, lava rock) with 2-6mm particle size. pH 6.0–7.2 is ideal.

• Pot Choice: Breathable terracotta is excellent for moisture control. Ensure pots have large drainage holes. A top dressing helps keep stems dry.

🌿 Fertilization & Growth Rhythm

• Feeding: Use a ¼-strength balanced or low-nitrogen fertilizer only during active summer growth. Never feed a dormant or cool/moist plant.

• Growth Cycle: Primary growth occurs in warm seasons. Watering should be reduced significantly during cooler winter months when growth slows or stops.

• Maintenance: Flush the soil occasionally to prevent fertilizer salt buildup, which shows as unsightly brown leaf tips.

✂️ Propagation

• Extremely Easy from Cuttings: Stem cuttings are most reliable. Allow cuts to callus for several days to a week, then plant in dry, gritty mix. Wait to water until roots form.

• Leaf Propagation: Many species propagate from single leaves. Let them callus fully before placing on dry medium.

• Seeds: Surface-sow on sterile, well-draining mix. Keep lightly covered and maintain consistent warmth (18–24°C).

⚠️ Troubleshooting Quick List

• 😐 Faded, All-Green Leaves → Needs more light. Gradually increase exposure to encourage compact form and stress colors.

• 📏 Leggy, Weak Growth → Critical light deficiency. Move to a much brighter location immediately and reduce nitrogen.

• 💦 Soft, Wrinkled, Dropping Leaves → Overwatering. Stop all water immediately. Check roots for rot. Increase airflow and repot into dry, gritty mix if needed.

• ⚫ Black or Brown Mushy Stems → Stem rot. Act fast. Cut well above the rot with a sterile tool. Let the cutting dry for 5-7 days, then re-root.

• ❌ No Flowers → Many Crassula need maturity, a tight root zone, and exposure to cooler, drier autumn periods to trigger blooming.

• 🪹 Cuttings Not Rooting → Likely watered too soon. Ensure full callusing and keep the medium barely moist, not wet.

• 🔥 Brown Leaf Tips/Edges → Usually fertilizer salt burn or low-humidity scorch. Flush the soil and protect from harsh, dry heat.

• 🥬 Pale or Yellowing New Growth → Can indicate micronutrient deficiency. Apply a light, balanced trace element supplement.

Success Mantra: Bright light + gritty, lean soil + disciplined drying periods. Their robust nature rewards patience and strong growing conditions. 🌞