When to Plant Basil in Iuka, Illinois (62849)

Location

Iuka, Illinois

ZIP Code

62849

USDA Zone

Last Frost

Wednesday, April 15, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Wednesday, February 18, 2026

Transplant Outdoors

Wednesday, April 29, 2026

Based on last frost Wednesday, April 15, 2026 · Zone 6b

Pro tip: Start Basil seeds indoors 8 weeks before your last frost date, then transplant outdoors around Wednesday, April 29, 2026.

🌿 Plant Details

Scientific Name Ocimum basilicum

Days to Maturity 60 days

Mature Height 12-24"

Spread 12"

Type Bush

Fruit Size N/A

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Regular (keep moist)

↔️

Spacing

12" apart

🌱

Planting Depth

0.25" deep

Seeds typically germinate in 5-10 days

Ready to Plant Basil in Iuka?

Get your seeds now so they're ready by Wednesday, February 18, 2026.

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🤝 Good Companions

TomatoPepperOreganoAsparagus

⚠️ Avoid Planting Near

RueSage

🤝

Full Companion Planting Guide for Basil

See which plants help Basil thrive, which to keep away, and raised bed layout tips →

🛠️ Supplies You'll Need

🌱 Seed Starting Trays 🪴 Seed Starting Mix 💡 Grow Lights 🌡️ Heat Mat 🪵 Raised Garden Bed 🌍 Vegetable Garden Soil 🛠️ Hand Trowel Set 🚿 Watering Can

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Common Basil Varieties

Popular cultivars to look for at your local nursery or seed supplier.

Genovese

open-pollinated

The classic Italian basil with large, fragrant leaves — the standard for pesto.

Thai Sweet Basil

open-pollinated

Anise-scented variety with narrow leaves; essential in Southeast Asian cooking.

Lemon Basil

open-pollinated

Citrusy, light-scented basil; excellent in salads, fish dishes, and teas.

Purple Ruffles

open-pollinated

Striking deep purple variety used as a garnish and in flavored vinegars.

Dwarf Bush

open-pollinated

Compact mounding plant ideal for containers and borders; small, intensely flavored leaves.

Cinnamon Basil

open-pollinated

Warm, spicy-scented basil with purple stems; great in fruit dishes and drinks.

Common Basil Problems

What to watch for — and how to fix it before it spreads.

🐛

Pests

Aphids

Soft green or black insects on new growth; excrete sticky honeydew that attracts ants.

Fix:

Blast with water; plant near marigolds; apply neem oil or insecticidal soap.

Japanese Beetle

Metallic green beetles skeletonize leaves in midsummer.

Fix:

Handpick in the early morning; knock into soapy water; use row covers during peak season.

Slugs

Ragged holes in leaves overnight; shiny slime trails visible in the morning.

Fix:

Apply diatomaceous earth around plants; use beer traps; avoid watering in the evening.

🍂

Diseases

Basil Downy Mildew

Yellowing between veins on upper leaf surface with gray fuzzy spores beneath; spreads rapidly in humidity.

Fix:

Plant resistant varieties (e.g. Amazel, Rutgers Devotion); improve airflow; avoid wetting foliage.

Fusarium Wilt

Seed-borne fungal disease causing sudden wilting, streaky brown stems, and plant death.

Fix:

Buy certified disease-free seed; rotate planting location annually; destroy infected plants.

💡

Common Mistakes

Letting it flower (bolt)

Once basil flowers, leaves turn bitter and production drops rapidly.

Fix:

Pinch flower buds weekly; make a final large harvest and preserve as pesto when bolting begins.

Watering overhead

Wet foliage is the primary trigger for downy mildew.

Fix:

Water at the base; water in the morning so leaves dry quickly; use drip irrigation.

Planting out too early

Basil dies in a frost and sulks when temps are below 50°F.

Fix:

Wait until nights are reliably above 55°F before transplanting outdoors.

🌾 Seed Saving Guide

🟢 Easy

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Let a few stems bolt and flower fully. Harvest seed heads when brown and completely dry.

Processing

Shake dried seed heads into a bag, separate seeds from chaff by blowing gently.

Seed Viability

Up to 5 years when stored cool, dark, and dry.

Pro Tip

Basil cross-pollinates between varieties — isolate by 150 feet or bag flower heads to keep varieties pure.

🪴

Raised Bed Planting Guides

A 4×8 bed fits 32 plants of Basil. See plant counts, spacing grids, and companion pairings for every bed size →

Frequently Asked Questions

When should I plant Basil in Iuka, Illinois? +

In Iuka (Zone 6b), start Basil seeds indoors around Wednesday, February 18, 2026 and transplant outdoors around Wednesday, April 29, 2026.

What is the last frost date for Iuka, Illinois? +

The average last spring frost date for Iuka, Illinois (ZIP 62849) is around Wednesday, April 15, 2026. This is based on NOAA climate normals for USDA Zone 6b.

How long does Basil take to grow? +

Basil typically matures in about 60 days from transplanting. In Iuka, that means you can expect harvest around Wednesday, April 29, 2026 plus 60 days.

Should I start Basil indoors or direct sow in Illinois? +

Basil should be started indoors 8 weeks before your last frost date. In Iuka, that means starting around Wednesday, February 18, 2026.

📚 More Basil Planting Guides

🗺️

Basil in Illinois

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 6b Basil Guide

All cities in your zone · Avg dates

→

Other Plants for Iuka

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Growing Basil in Zone 6b

Basil (Ocimum basilicum) is a popular garden vegetable. In Iuka, Illinois, which is in USDA Hardiness Zone 6b, you should start seeds indoors around Wednesday, February 18, 2026.

Your average last frost date is Wednesday, April 15, 2026. Plan to transplant your Basil seedlings outdoors around Wednesday, April 29, 2026, about 2 weeks after your last frost date.