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How to Plant Out Dahlias in Your Garden (5 Easy Steps)

Rachel is a passionate plantsperson, YouTuber and author living in Ireland. She grows a wide range of hardy subtropical and tropical plants.

Dahlias make such a gorgeous addition to the garden. Here are a few simple steps to follow when planting them out come spring.

Dahlias make such a gorgeous addition to the garden. Here are a few simple steps to follow when planting them out come spring.

How to Plant Out Dahlias in 5 Easy Steps

Dahlias can be planted out once all danger of frost has passed, and in my region, that means at the end of May. You must follow a specific process when planting out dahlias, and simple though it may be, it's important to get it right. Here's a quick and easy step-by-step guide to planting out dahlias in spring.

Before planting out your dahlias, it's important to acclimatize them to outdoor temperatures.

Before planting out your dahlias, it's important to acclimatize them to outdoor temperatures.

Step 1: Harden Off Your Dahlias

Before planting out dahlias, they need to be hardened off. Plants that have been started in a greenhouse or house need about a week of acclimatization to outside temperatures before going permanently out there. This can be accomplished by bringing your plants outdoors in their pots every day and back in again at night.

If this gorgeous plant is still somewhat new to you, here's some information on how to start dahlias in pots.

When planting out your dahlias, be sure to choose a location with full sun and fertile soil.

When planting out your dahlias, be sure to choose a location with full sun and fertile soil.

Step 2: Choose a Suitable Place for Planting

Choose a position for your dahlias. I like to plant mine in borders in the garden where other plants will hide their cabbagey foliage and they'll add to my flower display. Others grow dahlias to cut and bring indoors. Whatever you want them for, dahlias need full sun and fertile soil.

Step 3: Plant Your Dahlias

Dig a hole that comfortably accommodates your plant's root ball. Remove your dahlia from its pot, place some potting mix at the base of the hole and position your plant so that it's buried to the same depth as it was before. Backfill with a mixture of potting compost and earth. Firm down well.

To avoid breakages further down the line, I recommend staking your dahlias as soon as you get them in the ground.

To avoid breakages further down the line, I recommend staking your dahlias as soon as you get them in the ground.

Step 4: Stake Your Dahlias

Your dahlias will need staking, and it's better to do it now at this stage before your plant actually needs it to avoid breakages. Choose a sturdy stake; some dahlias, especially the dinner plate sized ones, can be quite heavy.

Step 5: Water Well

And finally, water your dahlias in well. You can expect flowers from July, and with assiduous deadheading, your dahlias will go on producing right until the first frosts. Happy growing!

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This content is accurate and true to the best of the author’s knowledge and is not meant to substitute for formal and individualized advice from a qualified professional.

© 2021 Rachel Darlington

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