80 to 85°F.
Lettuce can tolerate a few days of temperatures from 80 to 85°F, provided that nights are cool. Lettuce seed will germinate at 35°F, but optimum germination is 70 to 75°F.
What temp is too hot for lettuce?
Lettuce is a cool-season vegetable, meaning it grows best in temperatures around 60 – 65°F. Once temperatures rise above 80°F, lettuce will normally start to “bolt” or stop leaf production and send up a stalk to flower and produce seed. The leaves become bitter at this stage.
Can lettuce burn in the sun?
Keep Lettuce Plants Well-Watered
The lettuce leaves are comprised mostly of water and will desiccate and wilt in strong sunlight and dry soil.
How much sun is too much for lettuce?
As much as 12 hours of sunlight a day is okay for most lettuce varieties. The perfect spot for growing lettuce is anywhere that gets direct sunlight for most of the day.
Does lettuce spoil in heat?
Lettuce can last a few days outside after it has been picked or bought from the store. However, there are some things to avoid when storing your lettuce outside. A major detriment to storing your lettuce outside is heat. Heat is bad for lettuce because it causes the leaves to turn brown and wilt.
Can lettuce grow in hot areas?
Lettuce seeds germinate poorly in warm summer soil since heat may cause seed dormancy. Lettuce may bolt in response to the stress of high temperatures, and the leaves may become bitter as the plant puts its growth into flowering (see photo at right).
How do you protect lettuce from heat?
7 Tips for Growing Great Lettuce in Hot Weather
- 1) Choose heat tolerant varieties.
- 2) Germinate your lettuce seeds in cool soil.
- 3) Provide lettuce with extra shade.
- 4) Keep the soil evenly moist.
- 5) Plant a few seeds every 7-10 days.
- 6) Harvest your lettuce as baby greens.
- 7) Harvest the lettuce early in the day.
Is a greenhouse too hot for lettuce?
Lettuce is the perfect winter plant for your greenhouse. This leafy plant likes a cool environment. Therefore, you don’t have to heat your greenhouse as much as for other plants in winter.
How hot is too hot for garden?
Most plants grow best in temperatures ranging from 59°–86°F. When temperatures above 90°F are sustained for long periods, plant growth is slowed, and some plants begin to show signs of stress.
Does lettuce like morning or afternoon sun?
full morning sun
Arugula, lettuce, chard, kale and most other leafy greens are top candidates for partial shade at any time of day, and a longer list often thrives in sites that get full morning sun followed by afternoon shade.
Does lettuce like morning sun or afternoon sun?
The best times to plant are early in the morning or late in the day, so the plants aren’t exposed to the hot sun straight away.
Does lettuce need lots of water?
ANSWER: Lettuce should be watered not daily but instead about twice a week, or once every four or five days, for most of its growing period. It will need to be watered lightly but more frequently for the first two weeks after planting, perhaps daily, depending on your climate.
Will lettuce grow in 90 degree weather?
Lettuce seeds germinated two days after planting in 90 degree F temps. Not just growing – THRIVING in the heat! For the next week, I kept a close eye on my seedlings, watching for any signs of wilting, bolting, or heat stress. None.
How do you keep lettuce cool at a farmers market?
Hydro-cooling: Using Ice water to cool your veggies
An easy way to cool your vegetables is to use a container such as an ice chest full of ice water. Dip your vegetables into the ice water. The ice water will cool and hydrate your veggies.
What vegetables are heat tolerant?
15 Top Veggies to Grow in the Heat
- Sweet Potatoes. Sweet Potatoes grow well in summer and produce abundantly in as little as 90 days.
- Southern Peas. Southern Peas, also known as cowpeas are wonderfully versatile.
- Yard Long Beans.
- Hot Peppers.
- Green Beans.
- Okra.
- Zucchini Squash.
- Sunflowers.
Is 100 degrees too hot for a greenhouse?
So what temperature is too hot for your greenhouse? The general rule of thumb is that anything above 90 degrees Fahrenheit (or 32 degrees Celsius) is too hot. When your greenhouse temperature rises above 90 degrees, we advise you to take action to lower the temperature.
Should I cover my greenhouse in extreme heat?
Without protection from heat, few plants are likely to survive unharmed when subjected to prolonged high levels of heat and dry atmosphere within a greenhouse or conservatory.
Is it OK to water plants on a hot day?
Watering in the heat of the day shouldn’t hurt the plants — it actually cools them off — but it’s a far less efficient use of water as much of it will evaporate before reaching the roots. Avoid getting plants wet late in the day unless it’s the only possible time you can water them.
Should you water plants every day in hot weather?
When the temperatures climb higher than 100 degrees Fahrenheit, you should water frequently. Water to a depth of 1 inch. If your area isn’t getting natural precipitation, you may need to water with a hose or sprinkler on a daily basis. Otherwise, plan to water your garden at least two to three times per week.
What grows best in extreme heat?
Focus on plants that love the heat.
These include: tomatoes, eggplant, melons, peppers, malabar spinach, cowpeas, and lima beans. Sweet potatoes, okra, and southern peas can handle the most heat.
How often should lettuce be watered?
Lettuce has shallow roots, so plants need consistent watering. Check at least twice a week and water if the soil is dry down to 1 inch deep. Containers of lettuce need to be watered more frequently than garden beds, especially in the summer.