For leaf lettuce, start picking the leaves when there is at least 5-6 mature leaves of usable size. Usable size means about 2 long for baby lettuce, and 5-6 long for more mature lettuce. Keep picking until a seed stalk appears or the leaves become bitter.
Definition of coextruded. : produced by simultaneous extrusion of multiple layers The carbonated beverage container is a can within a can; the 7-layer coextruded package consists of a lightweight fluted plastic shell inside a smooth plastic outer container. â Predicasts Technology Update, 30 Apr. 1983 coâextruded plastic cans.
Silcretes, strongly indurated siliceous material, that form as a result of low-temperature silicification of weathered bedrock, regolith and/or sediments that are unconsolidated, at or near the surface. Silcretes are often outcrop prominently as low cliff lines, as they are very resistant to weathering.he grain size of the host material, from mud to gravel, is largely reflected in the micromorphology of the silcrete that is very variable. 4 silcrete types have been recognised (Summerfield, 1983) based on microfabric.