Grand Rapids TBR, Lettuce Seeds

Grand Rapids TBR Lettuce Seed

Frilled light-green leaves bring classic looseleaf texture
Award-winning lineage combines versatility with disease resistance
Baby leaves mature quickly for early salads
Productive plants continue toward full loose heads

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Key Attributes

Botanical Name

Lactuca sativa

Days to maturity

45 Days

Sun

Partial

Packet

500 Seeds

About Grand Rapids TBR, Lettuce Seed, Lettuce Seed

Grand Rapid TBR lettuce is a versatile variety derived from the classic Grand Rapid lettuce, known for its resistance to diseases like downy mildew. Originating in the early 20th century, this loose-leaf type features frilled, light green leaves that form a rosette, offering both beauty and texture. The flavor is crisp and mild, making it a delightful addition to salads and sandwiches. Grand Rapid TBR lettuce thrives in cooler climates and prefers well-drained soil, making it an excellent choice for both spring and fall gardens, particularly for home gardeners seeking a reliable and flavorful crop.

Growing details

Planting

Sow Depth

1/8"

Days to Germination

2–10 days

In-row plant spacing

6-12"

Row Spacing

12-18"

Plant profile

Maturity

Spring, Fall

Life Cycle

Annual

Plant Height

12 inches

Growth Habits

Rosette

Type

LOOSELEAF LETTUCE

Seed & variety

Seeds Per Ounce

28,125

Color

Green

Seed Type

Open Pollinated

Growing Season

Cool-Season Crop

Before Planting

Prepare for Lettuce by selecting a full-sun location in cool weather or light afternoon shade in warmer conditions, with fertile, moisture-retentive but well-drained soil. Work in compost and prepare a fine, level, weed-free seedbed. Plan dependable irrigation and avoid fresh manure or excessive nitrogen immediately before planting.

Planting

Direct sow lettuce as soon as the soil is workable, or start transplants indoors 3–4 weeks earlier. Germination is best in cool soil, generally below 70°F; high temperatures can cause dormancy. Keep the seedbed continuously moist until emergence. Thin after the first true leaves appear and make small succession sowings every 1–2 weeks during suitable weather.

Watering

Maintain consistently moist soil so lettuce leaves remain tender and mild. Water at the root zone whenever the upper soil begins drying, avoiding drought stress, saturation, and frequent wet foliage.

Fertilizer

Apply a light nitrogen-rich feeding after lettuce establishes if growth is pale or slow. Follow soil-test guidance and avoid overfertilizing, which causes tender, weak, or bitter growth.

Harvesting

Harvest outer lettuce leaves once they reach usable size, or cut whole heads when firm and full-sized. Pick during the cool morning for best texture. Harvest promptly before heat causes bolting or bitterness.

Tips

Use succession sowings and temporary shade to extend harvests. Choose heat-tolerant varieties for warm periods, and remove plants promptly when central stems elongate because leaves quickly become bitter.

AVG. Seeding Rate

For baby leaf: 1,000 seeds/16', 1 oz./400', 1 lb./6,400' at 60 seeds/ft.

Disease Resistance Abbreviations

Downy Mildew

Pests & Diseases

Downy mildew, lettuce drop, bottom rot, bacterial soft rot, and mosaic virus can destroy lettuce quickly. Choose resistant varieties and mosaic-indexed seed, rotate beds, and use raised rows where drainage is poor. Remove plants with cottony crown growth or mosaic; harvest sound heads before overmaturity invites decay.

Because lettuce is eaten for its leaves, scout early for aphids, flea beetles, leafminers, slugs, and caterpillars. Exclude pests with insect netting, remove damaged outer leaves, and handpick larger feeders.