When to Plant Impatiens in Elm, Pennsylvania (17521)

Location

Elm, Pennsylvania

ZIP Code

17521

USDA Zone

Last Frost

Friday, April 10, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Friday, January 30, 2026

Transplant Outdoors

Friday, April 24, 2026

Based on last frost Friday, April 10, 2026 · Zone 7a

Pro tip: Start Impatiens seeds indoors 10 weeks before your last frost date, then transplant outdoors around Friday, April 24, 2026.

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🌿 Plant Details

Scientific Name Impatiens walleriana

Days to Maturity 60 days

Mature Height 8-18"

Spread 12"

☀️ Growing Requirements

☀️

Sun

Partial to Full Shade (2-4 hours)

💧

Water

Regular (1-2 inches/week)

↔️

Spacing

8" apart

🌱

Planting Depth

0.125" deep

Seeds typically germinate in 14-21 days

Ready to Plant Impatiens in Elm?

Get your seeds now so they're ready by Friday, January 30, 2026.

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🤝 Good Companions

BegoniaFernHostas

🤝

Full Companion Planting Guide for Impatiens

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

🛠️ Supplies You'll Need

🌱 Seed Starting Trays 🪴 Seed Starting Mix 💡 Grow Lights 🌡️ Heat Mat 🌍 Flower Garden Soil ✂️ Pruning Shears 🚿 Watering Can

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🌾 Seed Saving Guide

🟡 Moderate

⚠️ Many varieties are F1 hybrid — look for OP/heirloom types

When to Harvest Seed

Seed pods explode when touched — bag ripening pods with a rubber band before they burst.

Processing

Collect seeds from bags as pods burst. Tiny seeds — dry on paper towel for 1 week.

Seed Viability

Up to 2 years when stored cool, dark, and dry.

Pro Tip

Most garden impatiens are F1 hybrids. New Guinea impatiens are almost always hybrid — look for old-fashioned OP varieties.

🪴

Raised Bed Planting Guides

A 4×8 bed fits 72 plants of Impatiens. See plant counts, spacing grids, and companion pairings for every bed size →

Frequently Asked Questions

When should I plant Impatiens in Elm, Pennsylvania? +

In Elm (Zone 7a), start Impatiens seeds indoors around Friday, January 30, 2026 and transplant outdoors around Friday, April 24, 2026.

What is the last frost date for Elm, Pennsylvania? +

The average last spring frost date for Elm, Pennsylvania (ZIP 17521) is around Friday, April 10, 2026. This is based on NOAA climate normals for USDA Zone 7a.

How long does Impatiens take to grow? +

Impatiens typically matures in about 60 days from transplanting. In Elm, that means you can expect harvest around Friday, April 24, 2026 plus 60 days.

Should I start Impatiens indoors or direct sow in Pennsylvania? +

Impatiens should be started indoors 10 weeks before your last frost date. In Elm, that means starting around Friday, January 30, 2026.

📚 More Impatiens Planting Guides

🗺️

Impatiens in Pennsylvania

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 7a Impatiens Guide

All cities in your zone · Avg dates

→

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Growing Impatiens in Zone 7a

Impatiens (Impatiens walleriana) is a popular garden vegetable. In Elm, Pennsylvania, which is in USDA Hardiness Zone 7a, you should start seeds indoors around Friday, January 30, 2026.

Your average last frost date is Friday, April 10, 2026. Plan to transplant your Impatiens seedlings outdoors around Friday, April 24, 2026, about 2 weeks after your last frost date.