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‘New Red Fire’ seeds are available in packets of 200 from David’s Garden Seeds via Amazon. This cultivar also grows well in cool weather. Use these tips: Preventionīefore sowing or transplanting, make sure you note the number of days to maturity and whether you have enough time to harvest ahead of the time when heat typically strikes in your area. It’s far more practical to focus on prevention. Even if you notice your plants are forming buds and pinch them off, you’ll only buy yourself a few extra days of mild-tasting greens out of the deal. This is an unforgiving cycle for us vegetable gardeners. The lack of moisture can be linked to the hot weather that instigates bolting, or it may be an independent cause of bad-tasting homegrown romaine, buttercrunch, or loose leaf varieties. Water stress can also cause lettuce to become bitter. But according to the available research, high temps are the most reliable cause of bolting. There’s also a day-length component, with lettuce bolting in response to longer days in early summer or shorter days in late fall. Most types start forming buds after a couple of days of temperatures in the 70 to 80☏ range. This makes sense if you think about it: As a plant that thrives in cool weather, heat or too little water feels life-threatening, so it begins the process of forming seeds to produce a new generation to carry on after it’s gone.

sativa will eventually bolt as it gets older, if the days are long enough.īut it will bolt more quickly in response to environmental conditions, particularly hot weather or dry spells.