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Many growers notice that some crops suddenly grow tall flower stalks and stop producing the edible leaves or roots they were expecting. This process is called bolting, and it is a natural developmental stage in many plants. Understanding why bolting occurs can help growers manage crops more effectively and choose varieties suited to their climate and production schedule.
Rootstock is the lower portion of a grafted plant that forms the roots and crown. It is selected for beneficial underground or structural traits such as:
Bolting refers to the rapid transition from vegetative growth (leaf or root production) to flowering and seed production. During bolting, a plant quickly sends up a tall flowering stalk, often accompanied by changes in flavor, texture, and productivity.
In many vegetable crops, bolting signals the end of harvestable quality. Leaves may become bitter, fibrous, or tough, and root crops may redirect energy toward flowering rather than root development.
Bolting is a normal part of a plant’s life cycle; it simply means the plant has shifted its priority from growth to reproduction.
Bolting is typically triggered by environmental stress or seasonal cues, particularly:
Warm weather is one of the most common triggers for bolting in cool-season crops such as lettuce or spinach.
Some plants respond to longer daylight hours, which signal the approach of summer and the need to reproduce.
Certain plants require a period of cold temperatures before they flower. Once the plant experiences cold and then warms again, it may bolt quickly.
If plants are left in the field too long, they may naturally bolt once they reach reproductive maturity.
Bolting occurs most often in cool-season vegetables, especially those grown for their leaves or roots.
Root crops may bolt after cold exposure followed by warm temperatures.
Examples include:
When bolting occurs, the plant directs energy to flowering instead of root growth, which can reduce root quality.
Some herbs also bolt quickly in hot conditions.
Examples include:
When herbs bolt, they often produce flowers and seeds rapidly, and leaf production declines.
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