If you plant tomato seeds at the right time, you can start the process around one month. We can see these physical changes around 3 or 4 weeks after the seeds germinate. When you see the first two or three true tomato leaves, plants grow 3 or 4 inches taller, and the outdoor temperature increases steadily over 60☏ (15☌) in the daytime, and 55☏ (13☌) at night is the best time to harden off tomatoes. Hardening off seedlings depends on the plant maturity and the outdoor temperature (including daytime and night). See also When To Transplant Tomato Seedlings | Explain Everything Furthermore, stunt growth plants are susceptible to many tomato pests and other diseases. This physical damage may result in stunt development and reduce the harvest. These harsh environments can result in tomato leaves sunburn, a shock of cold wind, and broken stems and branches. The seedlings harden process stimulating the plants’ natural defenses (leaf layers and wax layers) and allowing the seedlings to adapt to the new harsh environment. When new tomato seedlings are taken outdoors, it is exposed to intensive temperatures, strong winds, and direct sunlight. Typically these seeds germinate under growing lights, and it is not intense as sunlight. Generally, tomato seeds germinate indoors in late winter, and the indoor room has a controlled temperature, and there is no sunlight or strong winds. Why seedlings should be harden before transplanting?Īll tomato seedlings should be hardened before transplanting in pots, garden beds, raised beds, or unheated greenhouses. This hardening process is a vital step in moving tomatoes outdoors, and this will prevent tomato leaves from sunburn and stunt growth. When to harden off seedlings depends on plant maturity and minimum outdoor temperature.
#Harden tomato seedlings full
This hardening will help the plant withstand harsh weather conditions like full sun, rain, intense heat, strong winds, and cool night temperatures. Seedlings hardening off is the process that gradually introduces outdoor climate conditions to indoor plants without stressing the plants. Typically, tomato seeds germinate indoors and are exposed to a controlled indoor climate ( protected from bright sunlight, wind, rain, cold, and extreme heat). What does it mean to harden a tomato plant?
Why seedlings should be harden before transplanting?.
What does it mean to harden a tomato plant?.
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