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Dahlia and cosmos pot display

Overview

Dahlias come in a fascinating variety of shapes and sizes, and the pom-pom types, with their rows of incurved petals, resemble old-fashioned bathing caps. Dahlia 'Franz Kafka' lends itself - ironically, given its name - to a relaxed cottage-garden style, floating like balloons above the feathery foliage of Cosmos 'Sensation' and its delicate, pink petals.

Use a large container for this display, as this combination of plants reaches 1m in height. Prevent the planting scheme from looking too top heavy with a skirt of cerinthe. Its silvery blue leaves lift the dusky pink and purple flowers beautifully.


Plant it: sow in early spring, pot on in April, plant out in June
At its best: summer
Takes just: an hour

How to do it:

Adding cardboard to the container

1

If you're using a metal container, line the sides with cardboard to prevent it from heating up and drying out the compost.


Adding compost

2

Half-fill with multi-purpose compost and add gravel for drainage.


Planting up the pot

3

Plant up the centre of the container with dahlias and cosmos, and the front and sides with cerinthe.


Watering the plants

4

Backfill with compost, and firm gently to remove air pockets. Water well and place in a sunny location.




Discuss this pot & container

Talkback: Dahlia and cosmos pot display
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Guernsey Donkey2 04/03/2016 at 19:37

Do you have holes in this galvanized metal bath - if not how do you prevent it from becoming water logged?

Logan 05/03/2016 at 10:27

Yes you do need holes the plants won't like it unless you're growing bog plants

Verdun 05/03/2016 at 13:02

 Cosmos and dahlias together in a pot?? 

A vigorous dahlia will simply swamp the cosmos.  A dwarf vsriety will be swamped by tall cosmos.  Not a partnership for me