Osmin Purple

Basil

Zone 6b Save Garden

🌱 60d to harvest Upright

A velvet cascade of deep purple leaves with a faint, peppery sweetness—Osmin Purple basil perfumes the garden with an unmistakabl…

Crop Dates

Milestone	Date
Start Indoors	Mar 14th
Last Frost	Apr 25th
Transplant / Sow Outdoors	Jun 13th
Harvest Begins	Aug 12th
Harvest Ends	Oct 16th

Crop Details

Trait	Value
Days to Maturity	60
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

Recommended Companions

Jimmy Nardello Pepper

Juliet Tomato

Supersteak Tomato

Purple Marconi Pepper

Carolina Gold Tomato

Black Pearl Pepper

Frequently Asked Questions

What pest or disease commonly affects Ocimum basilicum (basil) like Osmin Purple, and how do I control it?

Basil is prone to downy mildew (often showing yellowing patches on leaves with a gray-purple growth underside) and it spreads quickly in cool, humid weather. Remove and discard infected leaves early, improve airflow, and water at the soil line instead of overhead. If problems persist, switch to a fresh planting area and avoid re-watering the same bed until the surface dries between waterings.

How often should I water Osmin Purple basil during its main growth phase, and what soil moisture level should I aim for?

Keep soil evenly moist but not waterlogged from when plants are established until harvest, since basil roots are shallow and dry out fast in full sun. Water deeply whenever the top 1 inch of soil feels dry, typically every 2–4 days in warm weather (less in cool or rainy periods). Mulch lightly if needed, and stop letting leaves stay wet overnight to reduce mildew risk.

How can I tell when Osmin Purple basil is ready to harvest?

Start harvesting around 50–60 days after sowing when plants are bushy with multiple leaf pairs and the foliage is fully colored. Pick by snipping just above a pair of leaves to encourage new branching, and harvest regularly so plants don’t rush into flowering. Once flower buds form, leaf quality drops—so harvest before they open and continue through the first flush of growth.

A velvet cascade of deep purple leaves with a faint, peppery sweetness—Osmin Purple basil perfumes the garden with an unmistakably aromatic lift. Leaves are tender and richly textured, holding their color beautifully as plants mature to a lush, upright form. Ideal for fresh garnishing, flavorful sauces, and striking purple accents that make every tomato pairing look as vibrant as it smells.

Sowing Tips

Transplant Conditions

Wait until soil reaches 60°F and nights stay above 50°F before moving outdoors. Harden off for 10 days first.

Expert Note

For the darkest purple color, grow in full sun and avoid letting transplants get chilled—purple basils hold color best with steady warmth after transplanting.