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High Mowing Organic Seeds
   

Organic Non-GMO Lettuce Seeds::Organic Non-GMO Green Romaine Lettuce::Organic Defender Lettuce

Organic Defender Lettuce  Organic Non-GMO Defender Lettuce - A disease resistant dark green romaine for salad mix. Defender has a similar growth rate to Parris Island, but is darker in color and more rounded in leaf shape; not as dark as Aerostar and with a wider leaf. A top notch selection for our Yankee Hardy Lettuce Mix due to its resistance to Downy Mildew. Not recommended for full size heads. (Lactuca sativa)

Days to maturity: 28 days baby
Disease Resistance: Downy Mildew (1-16,19, 21, 23)
SKU Description Our price
2574A 1/32 OZ $2.75
2574B 1/8 OZ $6.95
2574C 1/2 OZ $10.15
2574D 2 OZ $32.00
2574E 1/2 LB $88.00
2574L001 1 LB $165.00
2574l005 5 LB $750.00 ($150.00 per LB)

Unit Size
Quantity
   

Organic Romaine Cos Lettuce Comparison Chart

Item Code Variety Name Seed Heirloom Type Disease Resistance DTM: Baby DTM: Full Bolt-Tolerant Standout Characteristics
2581 Spretnak R   romaine, green DM (1, 4-21, 23-26) MTO-30   45 mini head, dark and glossy leaves, smooth and dense, blanched hearts
2559 Winter Density R   romaine, green   28 50 requires cool temperatures to germinate, heads average 9-10", heads are tightly and rounded, sit high on stem, nice texture and flavor
2543 Freckles R romaine, green/speckled   28 55 bright green with crimson splashes, upright, early color, crisp, good at any size
2596 Parris Island Cos R romaine, green LMV 28 55 uniform, grey-green heads, 8-12" tall, slightly savored
2606 Aerostar R   romaine, green DM (1-23,25) MTO-30 21 55   midi heads, dark green, relatively smooth
2587 Jericho Romaine R   romaine, green TB MTO-10 28 57 bright green, silky texture and sweet flavor, good for field and hoop house
2586 Green Towers R, P   romaine, green MTO-10   60   industry standard, very reliable, widely-adapted, uniform, 10-12" tall
2580 Coastal Star R, P   romaine, green CR MTO-30   65   dark green, tall, sturdy heads, firm ribs, great for hearts or box packing
2574 Defender R   romaine, green DM (1-16,19, 21, 23) 28     dark green, round and wide leaf

Disease Resistance   
APH    Aphids
BR    Bottom Rot
CR    Corky Root
DM    Downy Mildew (race specified if known)
LD    Lettuce Drop, White Mold, Sclerotinia
LMV    Lettuce Mosaic Virus
MTO-10, MTO-30    indicated that 0 seeds out of 10,000 or 30,000 seeds have tested positive, respecively (aphid resistant varieties are bred to reduce the spead of LMV from other crops or non-resistant varieties)
TB    Tip Burn

Organic Lettuce - Growing and Seed Saving Info

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Lettuce
Lettuce (Latuca sativa) is cool season annual in the Compositae family, which includes endive, escarole, chicory, globe artichoke, sunflower, Jerusalem artichoke, salsify, and burdock.
  • Looseleaf- var.crispa.  First to maturity, these fast growing lettuces do not form a head.  Good for babyleaf culture.
  • Butterhead - also known as bib, or Boston, this type forms a loose head with slightly oily leaves. Beautiful, sweet and tender, but bruises and tears easily.
  • Romaine – var.longfolia.  Romaine forms a tall dense upright head with a tender heart. It tolerates warm temperatures and is less prone to bolting.
  • Iceberg – var. capitata.  The fussiest type to grow, iceberg will form a compact round head if given a long cool season. It bolts easily if stressed.
Soil Requirements
Choose cool, well drained, loose soil with pH 6.2-6.8. Lettuce is sensitive to low pH.  Use 50-75lbs Nitrogen/acre, ~150 Phosphorus and Potassium/acre. Sidedress with N 3-4 weeks after planting. With transplanting, use 2lbs/50 gallons starter fertilizer, 4-8oz per plant.
Position
Full sun to partial shade
Seeding Depth
1/8”, seeds require minimum amount of light for germination.
Seeding Rate
Babyleaf - ~60 seeds/ft, in 2” bands. Full size - ~3 seeds every 8-10”.
Plant Spacing
Babyleaf – continuous band. Full size – 8-12”
Row Spacing
Babyleaf - Ύ” between bands, 16 rows/36” bed. Full size - 12-18” or 3 rows/36” bed, 5’ centers.
When to Sow
Lettuce can be seeded in the spring as soon as the soil can be worked. Days to maturity are from direct seeding in spring conditions, subtract 10-14 days if transplanting, subtract 7-10 days if planting in summer conditions, add 20 days if planting late summer-fall In certain areas, lettuce can be grown throughout the summer by choosing varieties which are heat tolerant; however, many lettuce varieties have difficulty germinating in soils above 75°F.  Start transplants 3-4 weeks before setting out.  Sow seeds 4 per inch in flats or small-cell plug trays, barely covering with fine soil.  If sowing into flats, transplant 2 weeks later into plug trays, pots, or into another flat at 1-2” apart. 
Other Considerations
Harden off seedlings by reducing water and temperature for 2-3 days before transplanting. 
Frost Tolerant
Choose cold tolerant varieties to withstand light late-season frosts. 
Drought Tolerant
Keep moisture levels even. Drought stress can cause bolting.
Heat Tolerant
Choose heat tolerant, bold-resistant varieties (such as Batavian types) for summer plantings.
Seed Specs
24,000 seeds/oz avg. M= 1,000, MM=1,000,000
Seeding Rate
Baby Leaf - 96M seeds/100’ bed (~ 4 oz), 960M seeds/1,000’ bed (2.5 lbs), 7.7MM seeds/acre (~20 lbs), using ~960 seeds/ft, 16 rows/bed, 36” beds, 6’ row centers. Full Size - 360 plants/100’ beds (~1/32 oz), 3,600 plants/1,000’ beds (1 oz), using 10” spacing, 3 rows/36” bed, 5’ center beds. 31M plants/acre (~2 oz), using 10” plant spacing. These specifications are meant to be general guidelines for the particular application as noted. They can be loosely applied across the board for lettuces/mixes found in this section.
Seed Coating / Pelleting Info
Some of the varieties we carry receive an organic film coating applied to the seed, which make the seed easier to see during planting.
Harvest
Cut lettuce holds best when harvested in the morning and cooled rapidly.  For salad mix or baby leaf production, harvest individual leaves when they reach desired size, or cut evenly across the bed making sure to stay above the growing tip.  For a continuous harvest, sow lettuce every 3 weeks.
Storage
Store just above freezing temperatures with 98% humidity.
Pest Info
  • Tarnished Plant Bugs cause brown scarring on stems. Romaine is especially susceptible.
  • Cabbage looper and cutworms can be controlled by Bacillus thuringiensis (such as Dipel DF, see Supplies) and/or spinosad (such as Entrust™), preferentially in rotation with one another to prevent selection of resistant individuals (check with your certifier before applying).
  • Leafminers burrow underneath the skin and leave weaving, translucent trails. They are usually controlled by natural enemies.
  • Slugs and Snails can be baited by beer traps. Practice clean cultivation and avoid mulch.
Disease Info
Many lettuce diseases are best prevented by production practices that maximize airflow around heads to stimulate rapid drying. Many varieties have been bred to have disease resistance.

RESISTANCE KEY:

DM:
Downy Mildew (race specified, if known), TB: Tip Burn, WM: White Mold, BHR: Bacterial Head Rot, BR: Bottom Rot, HS: Heat Stress, LMV: Lettuce Mosaic Virus, APH: Aphids,
  • Drop (Sclerotinia sclerotiorum, also called white mold). Grow on raised beds, rotate crops with grass.
  • Bottom rot (Rhizoctonia solani). Select plants with upright growth habit. Take care not to set seedlings too deep.
  • Lettuce mosaic virus (LMV) is highly seed-borne. Choose a reputable seed source. MTO-10, MTO-30: 10,000 or 30,000 seeds were tested for the presence of Lettuce Mosaic Virus, none was found. A disease-free test does not guarantee a seed lot to be disease-free, only that no pathogen was detected in sample.
  • Damping-off (caused by a number of soil-borne fungi) Avoid overwatering when plants are young.
  • Downy mildew (Bremia lactucae)
Seed Saving Instructions
Self-pollinated. Lettuce varieties will not cross pollinate with each other even at short distances, but beware of any wild lettuce which can cross with lettuce. Allow plants to "bolt" and eventually flower. Under wet conditions lettuce plants may need to be covered with a rain cover or grown in a greenhouse to prevent fungus from infecting the plant and seed heads. Carefully shake the seedheads into a paper bag to allow the mature seeds to be collected while leaving the immature seeds and flowers to keep growing. Gather every few days until no more seeds remain. Also, you can simply harvest the entire plant when about half of the seeds are mature and allow the rest to mature inside by standing up the plants in a box and on a cloth or tarp. Use an 1/8" screen to help with cleaning. Lettuce seed can remain viable for 3 years under cool and dry storage conditions.



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