Blue Spice

Family: Lamiaceae Herb

Planting Schedule

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Aromatic as fresh blue-sky sun—Blue Spice basil fills the garden with a cool, peppery fragrance and a distinctly sweet, herbal bite.

Leaves are tender and richly textured, forming lush, upright mounds that hold their flavor beautifully for classic Italian-style uses, from pesto to bright finishing sauces and fragrant oil infusions. Grow it for that signature “blue” spice note that turns everyday meals into something garden-fresh and unforgettable.

Light: Full SunMaturity: 45 DaysHabit: Upright

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Blue Spice Planting Dates by USDA Zone

Estimated US hardiness-zone windows for sow, transplant, and harvest. Enter a US ZIP above for exact local dates, or open a zone below.

Zone	Start Indoors	Sow / Transplant	Harvest
Zone 1a	Protected Environment Only
Zone 1b	Apr 27th	Jul 20th	Sep 3rd – Aug 1st
Zone 2a	Apr 20th	Jul 13th	Aug 27th – Aug 29th
Zone 2b	Apr 10th	Jul 3rd	Aug 17th – Aug 25th
Zone 3a	Apr 10th	Jul 3rd	Aug 17th – Sep 1st
Zone 3b	Apr 14th	Jul 7th	Aug 21st – Sep 21st
Zone 4a	Apr 10th	Jul 3rd	Aug 17th – Sep 24th
Zone 4b	Apr 8th	Jul 1st	Aug 15th – Sep 27th
Zone 5a	Apr 3rd	Jun 26th	Aug 10th – Sep 30th
Zone 5b	Mar 30th	Jun 22nd	Aug 6th – Oct 5th
Zone 6a	Mar 27th	Jun 19th	Aug 3rd – Oct 10th
Zone 6b	Mar 21st	Jun 13th	Jul 28th – Oct 16th
Zone 7a	Mar 16th	Jun 8th	Jul 23rd – Oct 20th
Zone 7b	Mar 6th	May 29th	Jul 13th – Oct 28th
Zone 8a	Feb 25th	May 20th	Jul 4th – Nov 5th
Zone 8b	Feb 16th	May 11th	Jun 25th – Nov 12th
Zone 9a	Jan 30th	Apr 24th	Jun 8th – Nov 26th
Zone 9b	Jan 5th	Mar 30th	May 14th – Dec 9th
Zone 10a	—	Oct 1st	Nov 15th – Feb 28th
Zone 10b	—	Oct 1st	Nov 15th – Feb 28th
Zone 11a	—	Oct 1st	Nov 15th – Feb 28th
Zone 11b	—	Oct 1st	Nov 15th – Feb 28th
Zone 12a	—	Oct 1st	Nov 15th – Feb 28th
Zone 12b	—	Oct 1st	Nov 15th – Feb 28th
Zone 13a	—	Oct 1st	Nov 15th – Feb 28th
Zone 13b	—	Oct 1st	Nov 15th – Feb 28th

Crop Details

Trait	Value
Days to Maturity	45
Sun Requirements	Full Sun
Growth Habit	Upright
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	70
Min Soil Temp (°F)	60
Min Night Temp (°F)	50
Harden Off (days)	10

Culinary Notes

Chef's Note

Blue Spice basil leans sweeter than many basils, with a cooling peppery aroma that shows up most when you keep it moving—blend briefly, drizzle at the end, or fold in off-heat. It delivers an upright, tender leaf texture that makes pesto smooth and fragrant rather than grassy.

Best Uses

classic basil pesto where you want a sweeter, cleaner herb character (blend with nuts/cheese and go lightly on heat)
fragrant oil infusion and quick herb oil for drizzling—keeps its perfume without turning bitter
bright finishing sauce: chiffonade and fold into warm butter, olive oil, or pan juices off-heat
fresh leaf scatter on hot pasta or grilled proteins for aromatic lift that doesn’t need cooking

Flavor Profile

sweet, aromatic basil with a cool peppery edge tender leaves with a silky, not-too-fibrous bite freshly crushed “blue spice” fragrance that pops as a finishing herb

Kitchen Pairings

parmesan garlic olive oil lemon pine nuts fresh mozzarella

Frequently Asked Questions

How do I manage aphids or powdery mildew on Blue Spice plants?

In Blue Spice, check undersides of leaves weekly for aphids and act immediately with a strong jet of water, then repeat every 2–3 days for 1–2 weeks if needed. If you see powdery mildew (white, dusty patches), remove the most affected leaves, keep plants spaced for airflow, and water at the base so foliage stays dry; re-check after 5–7 days and repeat removal until it stops spreading.

How often should I water Blue Spice during the main growing phase?

During the main growth period (from just after transplanting until about 2 weeks before harvest), water enough to keep the top 1 inch of soil consistently moist but not soggy—typically about 1 inch of water per week, adjusted for heat and wind. If leaves wilt by midday, water deeply in the morning and let the surface dry slightly between waterings to prevent rot.

How can I tell when Blue Spice is ready to harvest?

Blue Spice is ready at about 45 days when pods/greens reach their labeled size and color, and the stems feel firm rather than rubbery. Harvest in the morning for best flavor—pick frequently once they start maturing, because delays can reduce tenderness and intensity.