date:Aug 25, 2020
he case. The danger of the heat is that plants shoot early and that freshly sown lettuce does not emerge.
Van Hulle, who grows various types of lettuce, including head lettuce, arugula, Lollo bionda, mustard herb, frisee, mizuna, golden streak and tatsoi, says that heat sensitivity varies greatly. With head lettuce there is less loss than with oak leaf varieties, where the loss can be up to twenty percent, he cites some examples. Lamb's lettuce is the biggest risk group in warm weather, he says