Grand Rapids

Lettuce

45d to harvest

Sweet, crisp leaves with a cool, refreshing crunch—Grand Rapids loose-leaf lettuce forms tender, bright heads that feel silky at first touch and then snap cleanly with every bite. The flavor is pleasantly mild and sweet, making it an ideal centerpiece for fresh salads and quick tosses, while its delicate texture also shines in light, garden-fresh sauces and wraps. Fast to mature in about 45 days, it’s a dependable favorite for home gardeners who want reliable harvests and beautiful, edible greens all season long.

Crop Dates

Milestone	Date
Start Indoors	Apr 17th
Last Frost	May 15th
Transplant / Sow Outdoors	May 15th
Harvest Begins	Jun 29th
Harvest Ends	Sep 1st

Crop Details

Trait	Value
Days to Maturity	45
Sun Requirements	Part Sun
Growth Habit	Rosette
Support Needed	None
Planting Depth	Surface
Germination Temp (°F)	70
Min Soil Temp (°F)	40
Min Night Temp (°F)	35
Harden Off (days)	6

Frequently Asked Questions

What’s a common disease/pest problem for Lactuca sativa (Grand Rapids lettuce) and how do I control it?

Watch for aphids and slugs/snails on young lettuce, especially in warm, humid weather. Rinse aphids off with a strong stream of water, then spot-treat remaining clusters by wiping leaves with soapy water, and use slug traps or hand-pick at dusk to protect the tender plants. Keep the bed mulched lightly after seedlings establish and avoid wetting the foliage to reduce disease pressure.

How often should I water Lactuca sativa during the main growing phase?

During active leaf growth (roughly weeks 2–6), keep the soil consistently moist but not waterlogged—aim for about 1 inch (2.5 cm) per week, split into 2–3 waterings if it’s hot or windy. Lettuce is shallow-rooted, so let the top 1 inch (2–3 cm) dry slightly between waterings to prevent rot. If leaves start to feel limp or the plant tightens toward flowering, water more evenly.

How can I tell when Grand Rapids lettuce is ready to harvest?

Harvest when the heads are fully formed for a crisp, dense texture and the outer leaves are large and sturdy, typically around 45 days from sowing under good conditions. Start by removing outer leaves for a cut-and-come-again harvest, or harvest the whole head once it reaches the desired size and firmness—if it feels loose or starts to bolt upward, pick immediately to maintain crunch.