Asked by: Cyndi Eitner
home and garden landscaping

What temperature should you plant annuals?

Last Updated: 16th February, 2020

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Tender annuals, also called true annuals, have no tolerance for frost and must be planted in the spring when nighttime temperatures are above 55 degrees, when all danger of frost is past. Plants that fall into this category include: Impatiens (Impatiens balsamina), USDA zones 2 through 11.

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Correspondingly, what temperature is too cold for plants?

If temperatures below 32 degrees F are predicted, protect your plants! A moderate freeze with temperatures in the 25- to 28-degree Fahrenheit range can be widely destructive to vegetation. Frost protection is especially important for tender plants such as geraniums, begonias, impatiens, peppers, and tomatoes.

Beside above, is 40 degrees too cold for plants? Houseplants need to be taken indoors before overnight temperatures dip below 45 degrees Fahrenheit. Most tropical plants suffer harm from temperatures below 40 degrees. If the plant is crowding the pot, repot it into a larger container before taking it indoors.

Keeping this in view, what is the lowest temperature for annuals?

Tips for Growing Healthy Cold-Tolerant Annuals

  • Start by keeping the plants outdoors during the day any time the temperature is 40 degrees or above.
  • Be prepared to move them indoors when the temperature dips below 40 degrees.
  • The plant should be able to withstand a light frost after several days of acclimation.

Is it too early to plant annuals?

For these heat-loving annuals, planting too early can pronounce a death sentence as chilly air and cool soil causes plants to stall or even rot. The ideal time to plant is on a cloudy day. This protects newly planted annuals from having sun stress seedlings as they're settling into their new digs.

Related Question Answers

Amat Harchikov

Professional

Can I cover plants with garbage bags?

Never use plastic of any kind, including black plastic garbage bags, to cover plants, as plastic conducts cold to the leaves and will increase the likelihood of damage to the plant. Old sheets, blankets, drop cloths and special frost protection blankets (called Reemay cloth or floating row covers) work best.

Yari Olsohn

Professional

Can plants survive 40 degree weather?

Hardly Hardy
Although mature plants might survive light frosts, temperatures below 40 degrees Fahrenheit damage flower and fruit production, making tomatoes perennial only in U.S. Department of Agriculture zones 12 and up. They are grown as tender annuals in the United States.

Nayim Anuriev

Professional

Will a sheet protect plants from frost?

If you are only expecting a light freeze, you may be able to protect plants in a freeze simply by covering them with a sheet or a blanket. This acts like insulation, keeping warm air from the ground around the plant. The warmth may be enough to keep a plant from freezing during a short cold snap.

Anara Merckl

Explainer

At what temp should you cover plants?

* Cover plants at night. Covers vary in their insulation characteristics, but they can generally add 3 to 5 degrees to the ambient air temperature, helping to protect plants against freezing temperatures. They can be used on nights where temperatures drop as low as 28 F.

Arhimou Kassner

Explainer

What do you cover plants with when freezing?

Bed sheets, drop cloths, blankets and plastic sheets make suitable covers for vulnerable plants. Use stakes to keep material, especially plastic, from touching foliage. Remove the coverings when temperatures rise the next day. For a short cold period, low plantings can be covered with mulch, such as straw or leaf mold.

Marinka Huche

Explainer

What is the lowest temperature a plant can survive?

Rough guide for the lowest temperatures
  • Tender plants: 60°F (15°C)
  • Half hardy (many indoor plants): 50 - 55°F (10 - 13°C)
  • Hardy: 45°F (7°C)

Mallie Morgan

Pundit

What temperature is too cold for geraniums?

Temperature Thresholds
According to Protabase, geraniums grow well in the temperature range of 65 to 95 degrees F during the growing season, and in the winter low temperatures between 40 to 50 degrees F, according to the "A-Z Encyclopedia of Garden Plants."

Jacobina Cardaba

Pundit

Will 35 degrees hurt plants?

Tomato plants will survive temperatures down to freezing, so a low temperature of 35 degrees will not kill them. Insulate the plant with sheets or cloches if frost threatens. To ensure plant safety, protect tomato plants any time a temperature of 35 degrees or below is expected.

Melannie Diakhate

Pundit

What flowers can you plant before the last frost?

Calendula (pot marigold or English Marigold) are cold tolerant and can be planted before the last spring frost. Coreopsis, annual are cold tolerant and can be planted 2-3 weeks before the last spring frost. Dracaena (spike) are cold tolerant and can be planted before the last spring frost.

Pavlina Labonte

Pundit

What flowers can survive a freeze?

Freeze-Proof Plants
  • Lily-of-the-Valley. Don't let its dainty blooms fool you — lily-of-the-valley (Convallaria majalis) is a tough plant.
  • Siberian Iris. Hardy to Zone 3, Siberian iris shakes off cold cold winters.
  • American Mountain Ash.
  • Coral Bells (Heuchera)
  • Pansies.
  • Hosta.
  • Siberian Cypress.
  • 'Fastigiata' Spruce (Picea pungens var.

Jacki Bakirov

Pundit

How cold is too cold for begonias?

They prefer daytime temperatures around 70 degrees Fahrenheit and 60 degrees overnight. Temperature dips below 50 degrees might damage begonias and prolonged cold snaps can weaken or kill them. Bring potted plants indoors to a cool porch or basement.

Edil Aichriedler

Teacher

Will plants freeze at 32 degrees?

In weather reports, a freeze is any air temperature below 32 degrees, the freezing point of water. Whether that cold air actually damages plants in your garden will depend on how low it goes, the species of plant, whether it is in a sheltered spot in your yard, how long the low temperature lasts and many other factors.

Maj Yadov

Teacher

Does dianthus die in winter?

Dianthus is a genus of 300 species of flowering plants. These dianthus plants are biennial, or short-lived perennials, but because of our unpredictable winters they may either be killed in a hard freeze or survive through a mild winter. That's why we sell them as an "annual".

Tonette Albracht

Teacher

Will frost hurt marigolds?

Frost is the biggest indicator that your marigolds' blooming season is coming to an end. Frost occurs when the temperature along the ground hits 32 degrees. Temperatures of 40 F might not kill healthy marigolds, but when the air and ground around the plants hit the freezing mark, your marigolds will die.

Neoma Pask

Teacher

What flowers grow best in cold weather?

Plants That Survive Winter
  • Coneflower (Echinacea) Though the coneflower does not maintain its beautiful purple coloring in freezing temperatures, it will come back in the spring, strong as ever, if properly cared for in the offseason.
  • Lily of the Valley.
  • Blue Spruce.
  • Wintergreen Boxwood.
  • Catmint.
  • Coral Bells (Heuchera)
  • Pansies.
  • Hostas.

Jhonnatan Wollrab

Reviewer

How cold can snapdragons tolerate?

You might have seen pansies or snapdragons blooming through snow, and they can withstand fairly cold weather. They can handle a light frost, which is 28 to 32 degrees Fahrenheit, quite successfully. They may even survive a hard freeze, which is 28 F.

Aniello Katzman

Reviewer

How cold can lobelia tolerate?

It has very good frost tolerance, and can survive cold snaps down to 20 degrees F or even lower.

Peggie Aguerreberea

Reviewer

Should I cover plants at 35 degrees?

Winter is hard on your flowers. Half-hardy annual flowers can survive brief, light frosts and temperatures of 35 degrees to 45 degrees. To be safe, protect all your plants when the temperatures drop. If the forecast calls for a cold front or frost, use the methods below to cover your flowers.

Ansumana Andresson

Reviewer

Is 42 degrees too cold for tomato plants?

Tomato plants at any age or stage do not tolerate frost. You can generally move young seedlings outdoors when the temperature rises about 45 degrees Fahrenheit. A temperature of 46 F would be warm enough for tomato seedlings.