Zone 3 · Fruiting Veg Growing Guide

When to Plant Eggplant / Aubergine
in Zone 3

Heat-loving crop that needs a long warm season. Start early indoors with bottom heat — slow to germinate and slow to establish. Rewards patience with beautiful glossy fruit.

Plant outdoors
Jun 5 – Jun 20
Start indoors
Apr 5 – Apr 20
Last Frost
~May 15
Days to harvest
70–85 days
Difficulty
Medium
Start indoors — Zone 3
Harvest window: Aug – Sep

Planting Calendar

In Zone 3, Eggplant / Aubergine should be planted outdoors Jun 5 – Jun 20, after the average last frost date of approximately May 15. Start seeds indoors around Apr 5 – Apr 20 for a head start.

Very challenging in Zone 3. Use all season-extension tools. Short-season varieties like Hansel or Gretel.

Care Guide

Sunlight
Full sun · 6–8 hrs/day
Watering
Regular
Spacing
18–24 inches
Soil
Rich, well-draining, warm
Days to maturity
70–85 days
Soil pH
5.8–6.5
plant tip · Zone 3

Very challenging in Zone 3. Use all season-extension tools. Short-season varieties like Hansel or Gretel.

Feeding Schedule

How often
every 2 weeks
Feed type
balanced then high potassium
Key timing
switch to high-potassium at first flower

Heavy feeder like peppers and tomatoes. Start with balanced feed, switch to high-potassium when flowers appear. Consistent feeding produces larger, more tender fruit.

Companion Planting for Eggplant / Aubergine

What you plant next to eggplant / aubergine makes a real difference — some plants actively help, others compete or attract pests.

Grows well with
  • Beans
  • Peppers
  • Tarragon
  • Marigolds
Keep away from
  • Fennel
  • Corn
  • Brassicas

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Common questions

In Zone 3, start eggplant / aubergine seeds indoors around Apr 5 – Apr 20, then transplant outdoors Jun 5 – Jun 20 after your last frost around May 15. Very challenging in Zone 3. Use all season-extension tools. Short-season varieties like Hansel or Gretel.
Zone 3 has an average last spring frost of approximately May 15 and a first fall frost around Sep 15. These dates vary by specific location — use your ZIP code in the plant app for precision based on the nearest NOAA weather station.
Good companion crops for eggplant / aubergine include Beans, Peppers, Tarragon, Marigolds. Avoid planting near Fennel, Corn, Brassicas, which can compete for nutrients or attract pests.
Eggplant / Aubergine typically takes 70–85 days from transplant or direct sow to harvest in Zone 3. Expected harvest window: Aug – Sep.

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Eggplant / Aubergine in other zones
Crop Guides