Merlox Red Oak Oakleaf Lettuce - Organic


Merlox Red Oak Oakleaf Lettuce - Organic

Lactuca sativa
(53 days) Frank Morton’s first release of his “Merlox variations” combines the ultra-dark pigmentation of Merlot with the superior flavor of larger Emerald Oak. This uniform compact 10–12" oakleaf head boasts showy deep maroon leaves with a hint of blanched green in their centers. Loose but upright habit makes for clean cutting in salad-leaf harvest. Known as a cool-season lettuce, yet in the dry early heat of summer 2018 we found no bitterness at all—unique for such bold coloration. Good for winter culture as well: left outdoors in Central Maine with no row cover, mulched only by a generous snow cover, two-thirds overwintered and were ready to eat in early May. Bred with strong horizontal resistance to DM and SC. OSSI. Cold-hardy. Independent Breeder.

2781 Merlox Red Oak - Organic
Item Discounted
A: 1g for $3.75  
B: 4g for $11.50  
C: 14g for $29.00  
D: 28g for $50.00  
E: 112g for $175.00   ($166.25)
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Additional Information


  • All lettuce is open-pollinated.
  • 1 gram packet sows 25 ft; 2 grams, 50 ft; 1 oz, 500–700 ft. 700–1100 seeds/1g pkt.
  • 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.


  • 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.

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.


Mini lettuce heads are increasingly popular for wholesale accounts and winter harvests. Home gardeners with a succession of minis can reap quick single salads. You’ll find minis across the cold-hardiness and heat-tolerance spectrum. We’ve held these little class acts up against the expanding utility-patented mini-types and found comparable or better performance. While we do not intend to “go big” on tiny types, we add excellence as we find it. Here’s what we have so far:

Germination Testing

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