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Growing Dahlias

Growing & Propagating Dahlias

Workshop

March 7, 2026 @10am  

49 Simcoe St.    Lindsay, Ontario

In this 3 hour workshop, you will learn how to grow dahlias from

cuttings, use grow lights, properly pot & nurture tubers for early

planting, as well as early season growing.   $75 

​

text/call 705-324-3233    curlygirlgardening@gmail.com

Dahlias are gorgeous flowers, grown from tubers, that come in every colour, except blue.

They range in size from 1" pom poms to 15" fluffy petalled varieties, known as ‘dinner plate dahlias’.

Most varieties grow 4 to 5 feet tall. There are many different forms of dahlias, from tightly petalled

ball types, to peony & waterlily, cactus, collarette and more. You can never be bored with dahlias.

 

Tubers can be planted outside after last frost. Expect blooms mid-August to Frost. For earlier blooms,

start tubers inside 6-8 weeks before last frost and plant outside after last frost. Expect blooms early July.

Dahlias grown from cuttings will often bloom before a tuber, as they have a head start.

Rooted cuttings are identical to the mother plant and will produce flowers and tubers in the same

season, just as it would from a tuber. Cuttings are a great way to increase your stock at no expense.

 

Dahlias require at least 6 hours of sun. Ideally 8+ hours with a bit of shade midday.

Plant tubers 5” deep and water lightly. No need to water again till you start to see sprouting.

Dahlias are sensitive to rot, so plant in well drained soil.

 

If planting from a cutting, bury down 2-3 sets of leaves. (Strip off leaves first.)

Be sure to stake your dahlia when planting.

 

Dahlias are heavy feeders and thirsty plants. They need lots of nitrogen, so mix in well-rotted

manure or compost to soil when planting and fertilize weekly. I also add a handful of alfalfa

pellets, and bone meal to the hole when planting. I use seaweed fertilizer throughout the

season, till mid-August, but any type of fertilizer will do. Look for something with a higher

phosphorus level, such as a 10-15-10 to encourage blooming.

 

Dahlias don’t like soggy soil, or the tubers can rot, but they don’t like to dry out either.

The best way to test your soil is to stick your finger down a couple inches. If it is cool and damp,

don’t water. It’s always best to water deeply, less often, then frequently in small amounts.

 

To get a stronger, bushier plant with more stems and blooms, pinch your plant back

when it is approximately 12” tall. Pinch off the top 2-3 sets of leaves.

I know this sounds scary to do, but you’ll never regret it!

 

Dahlias are a “cut & come again” flower. Make yourself a bouquet! Take time to cut off

dead flowers so they don’t go to seed. The more you cut, the more you get!

 

Tubers must be dug up in the fall and stored for winter. They are best stored in

plastic bins with peat or vermiculate in a cool environment.

 

Follow me online for more tips & tricks throughout the season.

I hope I’ve made a dahlia addict out of you!

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dahlia gardens in Kawartha Lakes, Lindsay, Ontario, Curly Girl Gardening
dahlia gardens in Kawartha Lakes, Lindsay, Ontario, Curly Girl Gardening

Contact Me

Pick up or Viewing by Appointment Only

49 Simcoe St. Lindsay, ON

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