Lavender and Rosemary in Clay Soil (Zone 7): Amendments and Care

Clay soil in Tennessee (zone 7) can be amended for Mediterranean herbs.

Soil Fixes

1. Greensand: 5–10 lbs/100 sq ft. Loosens clay, adds potassium. Farm supply stores.
2. Lime: 1 cup per plant at planting, annually in spring. Raises pH to 6.5–7.5.
3. Grit: 30% coarse sand/perlite/pumice in planting hole.
4. Mound: Plant on 6–12" berm for drainage.

Fertilizer

• Organic only: liquid fish or fish/seaweed per label.
• Every 3 weeks spring–fall.
• No high nitrogen.

Planting

• Spring after frost.
• Space 24–36".
• Mulch gravel (not wood).

Varieties for Zone 7

• Lavender: 'Hidcote', 'Munstead', 'Phenomenal' (wet-tolerant).
• Rosemary: 'Arp', 'Hill Hardy' (survive -10°F).

With greensand, lime, grit, and mounds, both thrive in clay.