📍 Barton, MD · Zone 6b · Last frost Wednesday, April 15, 2026
✏️ ChangeWhen to Plant Cilantro in Barton, Maryland (21521)
Location
Barton, Maryland
ZIP Code
21521
USDA Zone
6b
Last Frost
Wednesday, April 15, 2026
📅 Your 2026 Planting Dates
Direct Sow Outdoors
Wednesday, March 18, 2026
Based on last frost Wednesday, April 15, 2026 · Zone 6b
Pro tip: Sow Cilantro directly outdoors 4 weeks before your last frost date.
🌿 Plant Details
☀️ Growing Requirements
☀️
Sun
Partial Shade to Full Sun
💧
Water
Regular (keep moist)
↔️
Spacing
6" apart
🌱
Planting Depth
0.25" deep
Seeds typically germinate in 7-10 days
Ready to Plant Cilantro in Barton?
Get your seeds now so they're ready by Wednesday, March 18, 2026.
* Affiliate links — we may earn a small commission at no extra cost to you.
🤝 Good Companions
⚠️ Avoid Planting Near
Full Companion Planting Guide for Cilantro
See which plants help Cilantro thrive, which to keep away, and raised bed layout tips →
🛠️ Supplies You'll Need
* Affiliate links — we may earn a small commission at no extra cost to you.
Common Cilantro Varieties
Popular cultivars to look for at your local nursery or seed supplier.
Santo
Slow-bolting variety that stays leafy longer in warm weather than standard cilantro.
Calypso
Highly bolt-resistant and high-yielding; ideal for warm climates with long growing seasons.
Leisure
Large-leaved variety that bolts slowly and regrows well after cutting.
Vietnamese Coriander
Heat-loving substitute for true cilantro; peppery flavor, perennial in warm zones.
Common Cilantro Problems
What to watch for — and how to fix it before it spreads.
Pests
Light green aphids cluster on stems and umbels, distorting flowers and reducing seed set.
Spray with water or neem oil; tolerate light infestations as cilantro is short-lived anyway.
Striking green-and-black caterpillar that can strip a cilantro plant quickly.
Relocate caterpillars to wild carrot (Queen Anne's Lace) — they become Black Swallowtail butterflies.
Diseases
Seedlings collapse at the soil line shortly after germination, caused by fungal pathogens in wet soil.
Use sterile seed-starting mix; water from below; ensure excellent drainage.
White coating on leaves; common in warm, dry weather with cool nights.
Improve airflow; direct-sow in well-spaced rows; apply potassium bicarbonate spray.
Common Mistakes
Cilantro bolts quickly in warm weather, leaving you with none after 4–6 weeks.
Sow small amounts every 2–3 weeks from early spring through fall for a continuous harvest.
Cilantro bolts immediately in temps above 80°F.
Grow in spring and fall; in hot climates, grow in part shade or choose "slow bolt" varieties like Calypso.
🌾 Seed Saving Guide
🟢 EasyWhen to Harvest Seed
Let plants bolt fully. Harvest seed heads when they turn brown but before they shatter.
Processing
Cut seed heads into a bag and shake. Dry for 1 week before storing.
Seed Viability
Up to 3 years when stored cool, dark, and dry.
Pro Tip
Cilantro seed (coriander) is also a culinary spice — you can save the same seeds you'd cook with.
Raised Bed Planting Guides
A 4×8 bed fits 4 per sq ft of Cilantro. See plant counts, spacing grids, and companion pairings for every bed size →
Frequently Asked Questions
When should I plant Cilantro in Barton, Maryland? +
In Barton (Zone 6b), direct sow Cilantro outdoors around Wednesday, March 18, 2026.
What is the last frost date for Barton, Maryland? +
The average last spring frost date for Barton, Maryland (ZIP 21521) is around Wednesday, April 15, 2026. This is based on NOAA climate normals for USDA Zone 6b.
How long does Cilantro take to grow? +
Cilantro typically matures in about 45 days from direct sowing. In Barton, that means you can expect harvest around Wednesday, March 18, 2026 plus 45 days.
Should I start Cilantro indoors or direct sow in Maryland? +
Cilantro does best when direct sown outdoors. In Barton, sow directly around Wednesday, March 18, 2026.
📚 More Cilantro Planting Guides
Other Plants for Barton
Growing Cilantro in Zone 6b
Cilantro (Coriandrum sativum) is a popular garden vegetable. In Barton, Maryland, which is in USDA Hardiness Zone 6b, you should direct sow seeds around Wednesday, March 18, 2026.
Your average last frost date is Wednesday, April 15, 2026. Cilantro grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.