When to Plant Sweet Alyssum in Mc Clure, Pennsylvania (17841)

Location

Mc Clure, Pennsylvania

ZIP Code

17841

USDA Zone

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 Sweet Alyssum directly outdoors 4 weeks before your last frost date.

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🌿 Plant Details

Scientific Name Lobularia maritima

Days to Maturity 45 days

Mature Height 4-8"

Spread 9"

☀️ Growing Requirements

☀️

Sun

Full Sun to Partial Shade

💧

Water

Moderate (1 inch/week)

↔️

Spacing

6" apart

🌱

Planting Depth

0.125" deep

Seeds typically germinate in 5-10 days

Ready to Plant Sweet Alyssum in Mc Clure?

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

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🤝 Good Companions

TomatoBroccoliLettuceVegetable Garden

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Full Companion Planting Guide for Sweet Alyssum

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

🛠️ Supplies You'll Need

🌍 Flower Garden Soil ✂️ Pruning Shears 🚿 Watering Can

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🌾 Seed Saving Guide

🟢 Easy

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Tiny seed pods form along stems after flowers fade. Harvest when stems are dry and tan.

Processing

Strip dried stems over a bowl — tiny seeds fall easily. Dry 1 week before storing.

Seed Viability

Up to 3 years when stored cool, dark, and dry.

Pro Tip

Self-sows prolifically in mild climates — often naturalizes without any active seed saving.

🪴

Raised Bed Planting Guides

A 4×8 bed fits 4 per sq ft of Sweet Alyssum. See plant counts, spacing grids, and companion pairings for every bed size →

Frequently Asked Questions

When should I plant Sweet Alyssum in Mc Clure, Pennsylvania? +

In Mc Clure (Zone 6b), direct sow Sweet Alyssum outdoors around Wednesday, March 18, 2026.

What is the last frost date for Mc Clure, Pennsylvania? +

The average last spring frost date for Mc Clure, Pennsylvania (ZIP 17841) is around Wednesday, April 15, 2026. This is based on NOAA climate normals for USDA Zone 6b.

How long does Sweet Alyssum take to grow? +

Sweet Alyssum typically matures in about 45 days from direct sowing. In Mc Clure, that means you can expect harvest around Wednesday, March 18, 2026 plus 45 days.

Should I start Sweet Alyssum indoors or direct sow in Pennsylvania? +

Sweet Alyssum does best when direct sown outdoors. In Mc Clure, sow directly around Wednesday, March 18, 2026.

📚 More Sweet Alyssum Planting Guides

🗺️

Sweet Alyssum in Pennsylvania

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 6b Sweet Alyssum Guide

All cities in your zone · Avg dates

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Growing Sweet Alyssum in Zone 6b

Sweet Alyssum (Lobularia maritima) is a popular garden vegetable. In Mc Clure, Pennsylvania, 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. Sweet Alyssum grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.