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Slobolt Looseleaf Lettuce

seeds
Choose an item size to add to your cart.
$3.25
Item: 2783-A
$5.25
Item: 2783-B
$10.00
Item: 2783-C
$17.25
Item: 2783-D
$50.00
Item: 2783-E
Lactuca sativa
(53 days) Open pollinated.

Slow early growth is the key to Slobolt’s success as a summer lettuce. A 12–14" Grand Rapids–type, Slobolt often will hold well into July. Slobolt is versatile: one grower in NY reported good results growing it in winter under lights as well as tightly spaced in his summer garden. Introduced 1946 by USDA. Showed some ability to germinate in warm temperatures.

Supplier Transparency:
② Family-owned companies or cooperatives, domestic and foreign
ships year-round
Quick Details
Hybrid Status
open pollinated
Days to Maturity
53 days
Lifecycle
annual
Color
green
Compare
Compare with other Looseleaf Lettuce
Variety Product Type Hybrid Status Days to Maturity Lifecycle Color
Black Seeded Simpson
Organic 		seeds open pollinated 42 days annual light green
Salad Bowl seeds open pollinated 46 days annual bright green
Salad Bowl
Organic 		seeds open pollinated 46 days annual bright green
Red Salad Bowl seeds open pollinated 46 days annual bronzed red
Red Salad Bowl
Organic 		seeds open pollinated 46 days annual bronzed red
Red Sails
Organic 		seeds open pollinated 49 days annual purplish red
Australian Yellow
Organic 		seeds open pollinated 50 days annual yellow-green
Hyper Red Rumple Waved
Organic 		seeds open pollinated 50 days annual deep red
New Red Fire
Organic 		seeds open pollinated 51 days annual light red
Slobolt seeds open pollinated 53 days annual green
Red Tinged Winter
Organic 		seeds open pollinated 60 days annual red-tinged green
De Morges Braun
Organic 		seeds open pollinated 64 days annual pink-tinged green
Merlot
Organic 		seeds open pollinated 32 days baby, 60 mature annual burgundy
Tango
Organic 		seeds open pollinated 45 days annual green
Additional Information

Lettuce

  • 700–1100 seeds/g.
  • Days to maturity are from emergence after direct sowing; for transplants, subtract 20 days.

Culture: Direct seed outdoors as soon as ground can be worked and repeat every 2 weeks for continuous supply. Or start indoors in March and at regular intervals thereafter for early transplanted successions. Optimal germination temperature range 40–70° though many varieties won’t germinate in soil temps above 75° and most shut down above 80°. Thin sowings frequently and ruthlessly to a final distance of 1' for full heads. Heavy nitrogen feeders.

Hardy. All save icebergs tolerate heavy frost. Fall and overwintered harvests are becoming standard practice. For summer harvest, select varieties carefully: bolting, bottom rot and tipburn are problems if a variety can’t take the heat! Using shade cloth can keep lettuce tender and sweet longer into summer. Sesquiterpene lactones produced in the latex render lettuce bitter when it bolts.

Saving Seed: Saving lettuce seed is easy! Leave spring-planted lettuce heads to bolt. Flowers will become white tufted seeds. Once dry on stalk, rub seeds off the plant into a paper bag. To ensure true-to-type seed, separate lettuce varieties by 10 feet.

Diseases:

  • BOR: Bottom Rot
  • DM: Downy Mildew
  • LMV: Lettuce Mosaic Virus
  • PM: Powdery Mildew
  • SC: Sclerotinia
  • TB: Tipburn
  • X: Xanthemonas

Pest: Aster Leafhopper (vector for Aster Yellows disease)
Cultural controls: control perennial broadleaf weeds near lettuce plantings, plow lettuce fields immediately after harvest.

Pest: Slug
Cultural controls: avoid mulch or nearby grassy areas.
Material: Sluggo

Disease: Bottom Rot
Cultural controls: rotate with grass-family green manures, plant in well-drained soil or on raised beds, more upright varieties escape infection.

Major Diseases: Downy Mildew, Grey Mold, White Mold
Cultural controls: rotation, reduce duration of leaf wetness, plant parallel to prevailing winds, use wide spacing, control weeds, use well-drained fields in spring and fall.
Material controls: MilStop

Germination Testing

For the latest results of our germination tests, please see the germination page.

Our Seeds are Non-GMO

Non GMO

All of our seeds are non-GMO, and free of neonicotinoids and fungicides. Fedco is one of the original companies to sign the Safe Seed Pledge.

Shipping

From early May through mid-December, items shipping from our garden seeds warehouse ship twice a week, usually Tuesday and Thursday. For quickest turnaround time order online by noon Monday or Wednesday.