What Size Pot To Start Dahlia Tubers

What Size Pots To Start Dahlia Tubers?

Starting your Dahlias off is always one of those really exciting spring jobs, it’s just a simple reminder that we are getting back to growing and that summer is just around the corner.

When starting your Dahlia tubers off though one question you may have is what size pot to use? Should you go with something large, or something that the tubers only just fit inside? Let’s have a look and find out.

What Size Pot To Start Dahlia Tubers
What Size Pot To Start Dahlia Tubers

What Size Pots To Start Dahlia Tubers?

If you are just planning on starting them in the pot they are going to grow in all summer then you just want to select a pot that is slightly bigger than the tuber.

You want to make sure there is a little room for tuber growth and that the full tuber slides in nicely. You don’t want to have to squeeze the tuber into the pot as then there is a good chance a bit of the tuber may break off.

Plant them in a pot just larger than the roots and make sure it has plenty of drainage, dahlias don’t like their roots to be sitting in wet soil.

Use a multipurpose compost, and that’s all there is to it really, I told you dahlias make excellent potted plants!

You will want to water regularly as dahlias don’t like their roots staying dry for too long.

Starting Dahlia Tubers In A Propagator

This is a great way to start your tubers if you want to get them going really early and take multiple cuttings. With this method, you can get two or three cuttings off your tubers before the growing season is even in full swing.

You want to use a propagator with a lid and as deeper a tray as possible. Plant the dahlia tubers in multipurpose compost with the neck of the tuber well above the soil level.

This is important as having the neck above the soil makes it a lot easier to snip off new growth to use as a cutting.

The propagator lid just helps to keep the temperature of the soil and the air around the tuber higher and will help promote growth.

More on Dahlias

Dahlias are simply stunning summer flowers, the pop pop head produces amazing displays. The plant is a member of the Asteraceae family along with daisies, asters and marigolds.

Usually grown from a tuber but they can also be grown from seed. The tubers require special care over winter here in the UK and many growers end up with an almost fanatical devotion to their dahlias.

Despite being unable to survive winter outdoors in most of the UK, they thrive in our summer conditions. The moderate but wet climate we have is absolutely perfect for them.


Dahlias make the perfect container flower and are commonly grown this way. Growing them in containers also makes preserving the tuber over winter a lot easier.