Asked by: Jutta Huard
home and garden landscaping

Do you cut back zinnias in the fall?

Last Updated: 11th January, 2020

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After zinnias flower, cut off the old flowers (a process called “deadheading”) to encourage more flowers to form. Zinnias are annuals and will die with the first fall frost. If you want them to reseed, let the last flowers of the season mature fully and scatter their seeds.

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Also asked, should you cut back zinnias?

Prune zinnia stems and blooms frequently to encourage thicker growth. Allow the plant to grow several inches before pruning. Prune back the stems using floral pruning shears. Plants purchased full size from a garden center should be trimmed back to about one-third of their height.

Subsequently, question is, where do you cut zinnia flowers off? Cut zinnia stems at an angle just above a bud joint. Zinnias are typically long-lasting in a vase—strip the stems of all but the most visible leaves before setting them in water.

Also asked, do zinnias bloom again after cutting?

Zinnias bloom more profusely once cut back.

Do zinnias bloom more than once?

Zinnias are annuals, so they'll grow for one season and produce seeds, but the original plant will not come back in subsequent years. Double-flowered zinnias have numerous rows of petals and their centers are not visible.

Related Question Answers

Eva Agabekoff

Professional

Do zinnias reseed themselves?

Zinnias (Zinnia spp.) reseed easily, creating a cut-and-come-again garden each summer. Heirloom varieties, cultivated for more than 50 years, are open pollinated and grow into plants identical to their parents.

Janosne Fructuoso

Explainer

Why are my zinnia blooms small?

Plants are shorter than is characteristic for the variety and the flowers are much smaller: When zinnias are overcrowded they can become stunted and produce smaller flowers. Always follow the spacing recommendations for each variety.

Leatrice Hohgraebe

Explainer

Do zinnias bloom all summer?

Zinnias produce colorful summer blooms that last well into fall. The bright-flowering zinnia (Zinnia spp.) The plants grow in all of the U.S. Department of Agriculture plant hardiness zones as annual flowers.

Ton Egelhof

Explainer

How do I get rid of spent flowers?

Deadheading flowers is very simple. As plants fade out of bloom, pinch or cut off the flower stem below the spent flower and just above the first set of full, healthy leaves. Repeat with all the dead flowers on the plant. Sometimes it may be easier to deadhead plants by shearing them back entirely.

Krisztian Venter

Pundit

What do good zinnia seeds look like?

Once the flower heads are completely brown and dry, grasp the petals and pull them out of the center of the flower. You should see seeds clinging to the ends of those petals. The seeds will be arrowhead-shaped, pointed on one end and broader on the other, each having a raised spine running up its back.

Evert SaƱa

Pundit

Do Zinnias need a lot of water?

Irrigation for Regular Maintenance. Zinnias can withstand moderately dry soil conditions but do better with supplemental watering. In general, zinnias typically need 1 inch of water once every five to seven days.

Gumersindo Larratasegui

Pundit

How do I store zinnia seeds for next season?

  1. Stop deadheading zinnias at the end of the summer to allow the flowers to develop seeds.
  2. Carry small paper or plastic bags into the garden in the fall, preferably on a dry day with little wind.
  3. Hold a bag or container under each seed head and snip off the seed heads with pruners, letting them fall into the container.

Hazael Fortis

Pundit

Why are my zinnias turning brown?

A: Zinnias can be prone to several bugs as well as the most common problem -- powdery mildew, which is a disease that turns the leaves whitish, then brown. The holes could be due to Japanese beetles or to a couple of other smaller beetles that sometimes eat zinnia leaves.

Boutros Tabaquinho

Pundit

Sokaina Peshke

Teacher

Do marigolds reseed?

All but the most hybridized varieties of marigolds are perennials. In the warmest regions the plants thrive year round, while in colder zones, they act as self-seeding annuals if you deadhead the blooms and drop them onto the ground. Marigolds aren't only attractive, they're useful as well.

Quirino Waldinger

Teacher

Is zinnia a perennial?

Zinnias are annuals. The first frost of fall kills them, and gardeners must plant them anew in late spring. Gardeners may sow seeds directly in well-drained soil outdoors after the last frost of spring. Succession plantings every two to three weeks will ensure a long season of vivid color.

Sayonara Steineke

Teacher

How do you care for potted zinnias?

Light: For best growth, zinnia flowers need full sun. Water: Water your zinnia flowers regularly so the potting soil stays constantly moist. Water below the plant, close to the soil so no water touches the zinnia plant's foliage.

Isabell Aguirregomezcorta

Teacher

Do you need to stake zinnias?

Stems of very tall zinnia varieties should be staked just a few weeks after they start their growth spurt, or when they are one-third their mature size. When staking zinnias, you must sink the stakes into the ground far enough to be firm. Then tie the zinnias to the stakes, using soft material like twine.

Arabela Abdrazakoff

Reviewer

Can you grow zinnias in pots?

Potting and Planting
Zinnias can grow in any type of container, including plastic or clay pots, wooden half-barrels, a window box or a hanging basket, but choose a container that has at least one drainage hole to help prevent fungal growth in the soil.

Mabelle Zarcero

Reviewer

What flowers will bloom all summer?

Here's our top 10 favorite summer blooming perennials:
  • Phlox. Garden Phlox has fragrant, showy blooms in pink, purple, white or red.
  • Hardy Hibiscus. Hardy hibiscus loves full sun and attracts both hummingbirds and butterflies.
  • Shasta Daisy.
  • Coneflower.
  • Black-eyed Susan.
  • Perennial Geranium.
  • Lavender.
  • Coreopsis.

Yesenia Valeiro

Reviewer

Why are my zinnias fading?

Some zinnia varieties fade more quickly than others, especially those in the `Profusion' series. When such blooms lose their color, remove them so fresh, colorful ones will grow. Any variety of zinnia is best in sun and a well-draining soil. Good air circulation is important, too.

Taneka Thirlwell

Supporter

Should you deadhead cosmos?

Deadheading regularly will help Cosmos to bloom longer. A good tip for deadheading Cosmos is not to just take the flower head off, but cut the stem right back to the first leaf below the flower head. Once you have cut the Cosmos flowers, put them straight into water.

Charanjit Boix

Supporter

Do zinnias need full sun?

A warm-season annual flower, zinnias like full sun and rich, well-drained soil. They are easy to grow and will tolerate average to slightly poor soils. Preparing garden beds with generous amounts of organic compost or well-aged animal manure will improve the health of plants tremendously.

Najem Hasainov

Supporter

Can zinnias grow indoors?

You can grow zinnias indoors if you grow them under fluorescent grow lights or in a greenhouse. Zinnias will last for months indoors if you remove the faded flowers. Prepare the growing containers. Fill 6-inch to 8-inch pots to within an inch of the top with indoor potting soil, the kind that has fertilizer in it.