Heatwave Lettuce Heirloom Mix Seeds
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CT MX
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CT MX
Heatwave Lettuce Heirloom Mix Seeds
Heatwave brings several lettuces together, including Grand Rapids, Prizehead, Royal Oak, Bronze Arrow, and Merveille des Quatre Saisons. Try a mix of leaves in one salad patch.
Packet: 75 seeds
Planting at a glance
- Season: Cool season
- Start: Direct sow, or start small transplants
- Seed depth: Surface sow, press into moist mix and cover only very lightly
- Germination: Usually 7–14 days around 60–70°F; high heat can inhibit sprouting
- Final spacing: Thin head lettuces to 8–12 inches; use closer spacing for baby-leaf harvest
- Light: Full sun
- Harvest planning: Baby leaves may be useful in about 30–40 days from sowing; full-size plants commonly need 60–80 days
When to plant
Plant during your local cool growing season. In colder regions, use spring or late-summer/fall sowings and allow enough growing time before hard freezes. South Florida outdoor window: September–February.
How to plant
- Prepare loose, well-drained soil or a clean seed-starting mix. Direct sow, or start small transplants.
- Surface sow, press into moist mix and cover only very lightly. Keep the seedbed evenly moist until seedlings emerge. Then water when the soil needs it, allowing excess water to drain.
- Thin or transplant to the listed final spacing. Give seedlings sufficient light and check moisture as roots establish.
How to harvest
Pick outer leaves, cut baby leaves above the crown, or harvest a head at the size you prefer. Quality declines when plants become stressed or bolt.
Aunt E’s tip: Keep sowings small and staggered during the suitable season so every head is not ready on the same day.
Growing notes and sources
Timing is a planning range, not a guaranteed harvest date. Temperature, moisture, variety and season affect the result. Count from the sowing or transplanting point stated above.
Grow with Aunt E
Seed light and growing light: Lettuce seeds need light to help them germinate. Press onto moist mix and leave uncovered or cover only very lightly as directed. After sprouting, give the seedlings good growing light.
Read the beginner growing guide · Compare the types and varieties · Get the germination instructions
Seed badges at a glance
- H
- Heirloom
- ★
- Hybrid
- OG
- Organic seed
- CT
- Cool season
- WS
- Warm season
- FS
- Full sun
- P
- Container friendly
- SS
- Small space
- CC
- Cut and come again
- FH
- Frequent harvest
- LG
- Needs light to germinate
- SP
- Spicy / hot
More seed codes
- IN
- Start indoors
- SH
- Partial or afternoon shade
- ST
- Support or trellis helpful
- D
- Dwarf
- B
- Bush habit
- V
- Vining or climbing
- SV
- Shorter vines
- SF
- Small fruit
- LC
- Large container
- F
- Fast harvest
- FL
- Flowers
- PW
- Pollinator interest
- PL
- Check pollination needs
- MX
- Seed mix
- DR
- Deep root space
- WD
- Well-drained soil
- DL
- Daylength sensitive
- LS
- Long growing season
- TR
- Tree crop
CC means cut and come again; FH means frequent harvest. Follow the crop instructions for what to harvest and when. OG appears only for documented organic seed. Codes are shortcuts; product details explain growing needs.
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