When to Plant Impatiens in Clarks Hill, South Carolina (29821)

Location

Clarks Hill, South Carolina

ZIP Code

29821

USDA Zone

Last Frost

Sunday, March 15, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Sunday, January 4, 2026

Transplant Outdoors

Sunday, March 29, 2026

Based on last frost Sunday, March 15, 2026 · Zone 8b

Pro tip: Start Impatiens seeds indoors 10 weeks before your last frost date, then transplant outdoors around Sunday, March 29, 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 Clarks Hill?

Get your seeds now so they're ready by Sunday, January 4, 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 Clarks Hill, South Carolina? +

In Clarks Hill (Zone 8b), start Impatiens seeds indoors around Sunday, January 4, 2026 and transplant outdoors around Sunday, March 29, 2026.

What is the last frost date for Clarks Hill, South Carolina? +

The average last spring frost date for Clarks Hill, South Carolina (ZIP 29821) is around Sunday, March 15, 2026. This is based on NOAA climate normals for USDA Zone 8b.

How long does Impatiens take to grow? +

Impatiens typically matures in about 60 days from transplanting. In Clarks Hill, that means you can expect harvest around Sunday, March 29, 2026 plus 60 days.

Should I start Impatiens indoors or direct sow in South Carolina? +

Impatiens should be started indoors 10 weeks before your last frost date. In Clarks Hill, that means starting around Sunday, January 4, 2026.

📚 More Impatiens Planting Guides

🗺️

Impatiens in South Carolina

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 8b Impatiens Guide

All cities in your zone · Avg dates

→

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Growing Impatiens in Zone 8b

Impatiens (Impatiens walleriana) is a popular garden vegetable. In Clarks Hill, South Carolina, which is in USDA Hardiness Zone 8b, you should start seeds indoors around Sunday, January 4, 2026.

Your average last frost date is Sunday, March 15, 2026. Plan to transplant your Impatiens seedlings outdoors around Sunday, March 29, 2026, about 2 weeks after your last frost date.