A picture of a Dahlia 'Yellow Star'

Dahlia 'Yellow Star'

Dahlia (9: S-c Group) 'Yellow Star'

Photo by Brighter-Blooms (All rights reserved)

Full Sun
Moderate care
Moderate watering


RHS hardiness


Minimum temperature

Expected size








2 years to reach maturity


  • spring
  • summer
  • autumn
  • winter

This plant has no fragrance

Dahlia 'Yellow Star' Overview

Semi-Cactus Dahlia's are along with Cactus Dahlia's are some of the most recognised type of Dahlia's. These fully double round blooms are formed from ray florets (petal) that are curved outwards (revolute or under) for between 25 - 50% of their length while remaining broad at the base. These pointed, flattened tube looking petals can also sometimes curve upwards at the tip as well. As group 9 Semi-Cactus Type Dahlia cultivars come in a wide range of colours and sizes from giant to miniature. there will be a plant to suit every garden. Regular watering and cutting flowers from this plant will improve performance. These plants may need staking; however, pinching out the growing tips in early summer will help it develop a bushier habit. The genus Dahlia contains around 20,000 cultivars which are predominantly derived from D. pinnata and D. coccinea. Most Dahlias are divided into groups based on the form of their flower heads, from dwarf varieties to tall bushes and even tree specimens. This group of cultivars can have the abbreviation (S-c) or the no. 9 included in their name.

Common problems with Dahlia 'Yellow Star'

Dahlia's tend to be affected by fungal diseases such as powdery mildew or grey mould if planted in poorly draining soil.

How to harvest Dahlia 'Yellow Star'

Flowers can be cut as required for floral arrangements. Cuttings are best taken in the early morning when the flower contains the most moisture content, use a sharp pair of scissors and take as long a stem as possible.

How to propagate Dahlia 'Yellow Star'


In spring take soft-wood cuttings from the shoots appearing from stored tubers.


Lifted clumps of Dahlia's can be divided in late winter, ensuring each section has an 'eye' (growing tip).

Special features of Dahlia 'Yellow Star'

Attractive flowers

Brings colour to the garden during autumn months.

Attracts useful insects

It attracts beneficial pollinators such as butterflies, bees and moths.

Pot plant

Can be grown in large containers.

Other uses of Dahlia 'Yellow Star'

Grown as bedding plants or for their flower heads, which are good for cutting or exhibition. Suitable for coastal conditions.