Research matters... Hydrangea Endless Summer

Hydrangea Endless Summer (Hydrangea macrophylla 'Bailmer') is unusual because it flowers more than once each year and the flowers are formed on new wood.

In the work reported here, a preliminary experiment showed that rooted cuttings of H. Endless Summer could produce flowers without having received any chilling.

Flowering was unaffected by day-length. In the main experiment, H. Endless Summer was grown with H. 'Merritt Supreme Pink' and H. 'Blue Danube' — both need a chilling treatment before they can flower.

All plants were either "pinched" or not at the start of treatment and were then grown in short-days or short-days plus a night-break for six weeks. This was followed by chilling at 4 degsC for 1,000 hours. After this, the plants were grown in a greenhouse at day/night temperatures of 21 degsC/16.5 degsC with lighting for 16 hours each day from high-pressure sodium lamps.

H. Endless Summer flowered much earlier than the two cultivars but had fewer flowers than H. 'Blue Danube' and its branches were too short, especially when it was not pinched. The lack of a chilling requirement means H. Endless Summer has great potential as a flowering pot plant, but more work is needed to produce plants of the highest quality.

Comparative Forcing of Hydrangea macrophylla 'Bailer' (sic) as a Florist's Hydrangea by Anderson, Weiland, Pharis, Gagne, Janiga and Rosenow (2009). Scientia Horticulturae 122 (2): 221-226. The contents of issues of Scientia Horticulturae and abstracts of papers are provided at www.elsevier.com/locate/scihorti.


Have you registered with us yet?

Register now to enjoy more articles and free email bulletins

Sign up now
Already registered?
Sign in

Read These Next

Tractors: market roundup

Tractors: market roundup

Manufacturers are working to provide solutions to many challenges. Sally Drury looks at their newest models.

Aster

Aster

Brightening up gardens in autumn, these daisies are seen as a gem in the gardener's arsenal, writes Miranda Kimberley.

Are tree suppliers seeing the benefit of the health message of trees?

Are tree suppliers seeing the benefit of the health message of trees?

The message that health, the environment and business all benefit from trees is finally getting through, but are nurseries seeing an upturn? Sally Drury reports.


Opinion... Why no-deal Brexit should worry you

Opinion... Why no-deal Brexit should worry you

Whether you voted leave or remain all those years ago, a "no-deal" Brexit should worry you.

I will not be importing oaks this season. Will you?

I will not be importing oaks this season. Will you?

I find myself in a difficult situation. A few weeks ago I was fortunate to be present to hear details of imminent changes to regulations concerning Oak Processionary Moth (OPM) and oak trees. I heard details, asked questions and probed the implications of these changes. That may not sound like a difficult position to be in, yet I am uneasy.

Opinion... Better targets to tackle pollution

Opinion... Better targets to tackle pollution

Lobby groups jumping onto fashionable campaigns, often to promote their own interests, can do much more harm than good. Take, for example, the move against black polythene plant pots and containers.


Follow us on:
  • Facebook
  • LinkedIn
  • Twitter
  • Google +
Horticulture Jobs
More Horticulture Jobs

Horticulture Week Top 60 Ornamentals nurseries

See our exclusive RANKING of ornamentals nurseries by annual turnover plus the FULL REPORT AND ANALYSIS

Tim Edwards

Boningales Nursery chairman Tim Edwards on the business of ornamentals production
 

Read Tim Edwards

Pest & Disease Tracker bulletin 

The latest pest and disease alerts, how to treat them, plus EAMU updates, sent direct to your inbox.

Sign up here

Are you a landscape supplier?

Horticulture Week Landscape Project Leads

If so, you should be receiving our new service for Horticulture Week subscribers delivering landscape project leads from live, approved, planning applications across the UK.

Peter Seabrook

Inspiration and insight from travels around the horticultural world
 

Read more Peter Seabrook articles