Ageratum houstonianum 'Florist Blue': The Perfect Sky-Blue Cut Flower
Are you looking for a reliable, prolific summer flower that excels in both the ornamental garden and a cut bouquet? Ageratum houstonianum 'Florist Blue' (also known as Mexican Liver Balm) is an indispensable classic for every grower. In 2026, we see a growing demand for natural, "fluffy" textures in bouquets, and this variety perfectly meets that trend.
What makes 'Florist Blue' unique?
Unlike the low border varieties often found in garden centers, 'Florist Blue' was specifically selected for its long, sturdy stems. The plant reaches a height of approximately 60 to 80 centimeters, making it ideal for cut flower production. The inflorescence consists of dense clusters of soft, thread-like flowers in a rare, bright sky blue that contrasts beautifully with green foliage or warm-colored dahlias.
Cultivation advice for small growers
Growing Ageratum from seed is relatively easy, provided you consider a few crucial factors:
- Sowing technique: Start sowing seeds under glass (indoors or in a greenhouse) in March or April. The seeds are very fine and need light to germinate. Therefore, cover them lightly with soil; a light press is sufficient.
- Germination: At a constant temperature of 18-21°C, the seeds germinate within 7 to 14 days. Provide sufficient light to prevent the seedlings from becoming lanky.
- Planting out: Wait to plant out until the risk of night frost has completely passed (usually after the Ice Saints in May). Ageratum prefers a sunny spot and fertile, well-drained soil.
- Topping for volume: For small growers, it's essential to top plants when they're about 15-20 cm tall. Removing the growing tip encourages the plant to produce more side branches, resulting in a larger harvest of flower stems.
Use and Harvest
The 'Florist Blue' is known for its excellent vase life. Harvest the stems just as the first flowers in a cluster are opening. When fully open, the flowers attract many pollinators, such as butterflies and bees, making this plant an ecologically sound choice for biodiversity in the garden.
In bouquets, Ageratum often serves as a filler. Its soft texture softens the harsh lines of larger flowers and lends a dreamy look to cut-flower bouquets. The cool blue is also one of the most sought-after shades in horticulture, as true blue flowers are relatively rare.
Why choose our seeds?
Ageratum houstonianum 'Florist Blue' seeds are carefully selected for their germination rate and varietal purity. For small growers, we offer packages perfectly suited to the scale of a pick-your-own garden or small-scale sales, without the need to build up large bulk stocks.
