Dahlia Grow-A-Long

Lifting Dahlias in Spring

Left to their own devices Dahlia tubers can strangle themselves in a vice of old and new growth.

This can result in a decrease of flower quality and production. Plants could even perish.

Every few years it’s a good idea to dig them up and regenerate them through division and cuttings.

This is step one. Videos are streamed live from the garden so stay tuned for the next step!

Dahlia Gall

Dahlias can suffer from Gall.

Spring is the ideal time to check your plants to make sure your stock is healthy.

Technically there are two types

Crown gall

Caused by bacterium Rhizobium radiobacter (synonym Agrobacterium tumefaciens) which causes the plant to grow in a disorganised way, producing swollen galls.

Leafy gall

Caused by bacterium Rhodococcus fascians, which again causes the plant o grow in a disorganised way, this time producing dense clusters of distorted, leafy shoots.

The latter seems to be the most common here in the UK. Both bacterium enter the plant through wounds in roots or stems. In this video I explain in more detail including examples.

Dividing Dahlias

After a few years Dahlia’ tubers can build up into congested clumps.

Old dead material from previous seasons growth is mixed with the new tubers created each season. As the clump ages the number of new tubers multiply, interlocking underground and can basically ‘strangle themselves’.

Ultimately congested clumps will effect the quality of the flowers and can cause the death of the Dahlia. You can reinvigorate these clumps by dividing these tubers, removing the spent dead material and releasing the new tubers into smaller clumps to be replanted as well as creating lots of new plants for free!

Dividing Huge Dahlia Tubers

Sometime dividing Dahlia Tubers can be a bit intimidating, in this video I tackle a huge Cafe Au Lait tuber.

Starting Dahlia’s ‘Pot Sizes’

Dahlias are very tender plants that can’t go out into the garden until after the last frosts, Light sensitive Dahlias really come into their own as the days start to shorten but you can get an extra month of flowers by starting them undercover now.

Watering Waking Dahlia Tubers

It can be very easy to overwater you Dahlias, especially when waking tubers up. They don’t have an ‘off switch’ too much water will rot the tuber.

Dahlia Tubers Finding the ‘eyes’

Dahlias shoot from swollen nodes we commonly called ‘eyes’. To be begin with spotting that can seem like a black art. In this video I explain what an eye actually is, why it’s so important. There are also lots of examples to compare against your own Dahlia Tubers.

Dahlia cuttings

Quick easy Dahlia cuttings

Pinching Dahlias

In this video I explain how and why we pinch dahlias with examples of pinched and unpinched plants.

Dahlia Cuttings Update

It’s been 4 weeks since we took our Dahlia cuttings.

Deadheading Dahlias (how to tell new buds and deadheads apart)

Simple way to check for spent blooms when deadheading Dahlias:

New buds are always round as a button

Deadheads or spent blooms are always a pointed cone shape.