How to Grow Rosemary Tuscan Blue

Rosemary Tuscan Blue

Rosmarinus officinalis 'Tuscan Blue'

herb

Tuscan Blue is a vigorous, upright cultivar of rosemary prized for its deep blue flowers and robust growth habit. This Mediterranean herb produces aromatic, needle-like foliage and is one of the most cold-hardy rosemary varieties available. It's excellent for culinary use, ornamental purposes, and attracts pollinators.

Growing Conditions

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Sun: Full sun, 6-8 hours daily (8+ hours preferred)

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Water: Low to moderate water needs. Water deeply but infrequently; allow soil to dry between waterings. Drought-tolerant once established. Reduce watering in winter.

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Spacing: 24 inches

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Days to maturity: Ready to harvest lightly in 6-8 weeks; full production in 6-12 months

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Planting depth: 0.5

Soil

Type: Well-draining sandy or rocky loam

pH: 6.0-7.5

Amendments:

Perlite or coarse sand for drainage Small amount of compost at planting Gravel mulch to improve drainage

Growing Zones

Find your zone →

Thrives in zones 8-11; can survive zone 7b with winter protection

8a 8b 9a 9b 10a 10b 11a 11b

Growth Stages

Seedling/Young Transplant

4-6 weeks from seed or when purchased

Small plant with thin, tender stems and developing needle foliage; may be 2-4 inches tall

Keep soil moist but not waterlogged; provide bright light; protect from strong winds; begin hardening off before transplanting outdoors

Establishment

2-3 months

Plant develops stronger root system and more substantial woody stems; foliage becomes denser and more fragrant

Water regularly but allow soil to dry slightly between waterings; begin light pruning to encourage bushiness; do not fertilize heavily

Vegetative Growth

Ongoing during growing season

Upright growth with increasing stem thickness; narrow, gray-green needle leaves densely arranged; plant reaches 2-4 feet tall

Reduce watering frequency as plant matures; prune regularly to maintain shape and encourage branching; minimal fertilizer needed

Flowering

Spring through fall; heaviest in spring/early summer

Deep blue to purple flowers emerge along stems; blooms appear in clusters; plant remains ornamental and aromatic

Flowers attract bees and pollinators; continue regular pruning to shape plant and promote more blooms; flowers are edible and aromatic

Mature/Harvest-Ready

Year 2 onwards

Fully established woody shrub, 3-5 feet tall and 2-3 feet wide; constantly producing new foliage and flowers

Harvest regularly to encourage new growth; prune annually in early spring; reduce water in winter; fertilize minimally or not at all

Companion Planting

Plan your garden →

Plant with:

Thyme Sage Lavender Oregano Marjoram Santolina Catmint Salvia

Avoid planting near:

Fennel Kochia Plants requiring frequent watering and rich soil

Common Pests

Increase humidity; spray with water; use neem oil if infestation is severe; ensure good air circulation
Improve air circulation; avoid overhead watering; apply sulfur dust or fungicide if severe; remove affected leaves
Hand-pick beetles; prune out heavily infested stems; encourage beneficial insects; use insecticidal soap if needed
Use yellow sticky traps; spray with neem oil or insecticidal soap; improve air circulation
Ensure excellent drainage; do not overwater; remove affected plant material; replant in fresh, well-draining soil

Uses

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Cooking & Seasoning

Culinary

Fresh or dried sprigs flavor meats, roasted vegetables, breads, oils, vinegars, and Mediterranean dishes. One of the most versatile culinary herbs with a bold, piney flavor that intensifies when dried. [source]

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Herbal Remedies & Wellness

Medicinal

Traditionally used to enhance memory and circulation; brewed as tea for digestion support. Contains antioxidants and may support cognitive function and anti-inflammatory effects. [source]

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Infusions & Extracts

Household

Steep sprigs in oils, vinegars, or alcohol to create infused products for cooking or household use. Dried sprigs can be used in sachets or potpourri for their fragrance. [source]

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Garden & Landscaping

Ornamental

Excellent as an ornamental shrub with deep blue flowers, attractive gray-green foliage, and upright form. Works well in Mediterranean gardens, herb gardens, containers, and as a low-maintenance landscape plant. [source]

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Pollinator Support

Wildlife

Deep blue flowers attract bees, butterflies, and other pollinators throughout the growing season. Provides both nectar and pollen for beneficial insects. [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Harvest Tips

Begin light harvesting when plant is 6-8 weeks old, taking small sprigs from the top. Once established, harvest regularly (every 2-3 weeks) by cutting 3-4 inches from branch tips; avoid cutting into bare wood. Best harvested in morning after dew dries. Can be harvested year-round in mild climates; reduce harvest in winter in cold zones. Flowers are edible and can be harvested along with foliage.

Fun Facts

🌱 Tuscan Blue is one of the most cold-hardy rosemary cultivars and can survive brief freezes to 10°F (-12°C) with protection, making it more reliable than other varieties in cooler climates.
🌱 Rosemary's name comes from Latin 'ros marinus' meaning 'dew of the sea,' reflecting its native Mediterranean coastal habitat and association with maritime cultures.
🌱 The aromatic oils in rosemary leaves are strongest in early morning and have been used for centuries in both culinary and medicinal applications across Mediterranean, European, and Middle Eastern cultures.

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