After years of trial cultivation, we can no longer keep "Concept" for ourselves; several test growers have expressed their admiration! It is a combination of Cos lettuce and Batavia lettuce. The head is built high and vase-shaped as with the Cos lettuces, but with more of a head formation as with Batavia lettuce. The colour is medium green in the thick, crunchy succulent outer leaves which encloses a brighter, delicate heart. Concept is also grown more closely for "small leaf" production. A portion contains about 250 seeds. MOFGA-certified seed. See under Info etc. - Ecologically grown seeds.


Product number:4135
Scientific name:Lactuca sativa var. capitata crispum
Botanic family:The Sunflower Family - Asteraceae
Days to maturity:58
F1 Hybrid:No
New variety:No
Sowing time:pre-cultivate: march-may/direct:may-aug
Sowing depth:0.5 cm
Plant spacing:20-30 cm
Row spacing:35-50 cm
Germination time:5-8 days
Height:20-30 cm
Plant location:sun-half shade
Seeds/g:700-1100 seeds
Heirloom variety:No

Cultivation advice


Sow thinly about 0.5 cm deep! The seeds need light and a temperature below 18oC to germinate. A higher temperature causes late and bad germination. Lettuce can be forced very early in a green-house (soil temperature at least 5°C) or sown indoors and in hotbeds 3-5 weeks before handle several degrees of frost. Direct sowing can take place as soon as the soil is ready. Water the row before sowing if the soil is dry. That lowers the temperature some when sowing in high summer. To get a supply of lettuce all through summer and autumn, sow successively or several kinds of different growth times! Autumn sowing for wintering could succeed. 


Thin out early! Batavia lettuce need a mutual space of 20-30 cm to be able to form heads, 35-50 cm between the rows.  


The lettuce heads should be harvested as soon as they have made heads.


700-1100 seeds/g, a normal portion sows 5-10 m outdoors or yields 100-250 seedlings for setting and 5 g for 100 m if sowing directly and 20 g yield seedlings for 1000 m2. 50-100 g sows 1000 m2 directly.
A portion contains about 250 seeds.