Getting the most out of Harper

Harper is an early and vigorous hybrid with an outstanding agronomic package which gives highly consistent yields and oil outputs.

Harper yield components
Gross output 101% High
Seed yield 102% High
Oil % 45.3% High
Glucosinolate content 10.0μmol Low
Regional suitability National
Soil types No differences known
Sowing date Early Aug - early Sept
Sowing method No differences known
Harvest method Desiccation or swathing
 Variety characteristics      
Early vigour  low table 4 dots high
Winter hardiness  low table 4 dots   high
Earliness of flowering late table 5 dots early
Earliness of maturity  late  table 4 dots early
Plant height tall  table 3 dots short
Lodging resistance  low  table 4 dots high
Disease resistance      
Phoma/stem canker  low table 5 dots high
Light leaf spot
 low table 4 dots high
Response to fungicides
low  table 3 dots high

Data extracted from AHDB RL 2017/18 (E/W).

Ease of management

Harper has a good combination of Phoma, LLS and lodging resistance plus high oil content. It is one of the earliest maturing hybrids on the 2017/18 RL E/W and offers growers highly consistent yield performance as well as good autumn and spring vigour.

Harper's disease resistance package makes it suitable for all UK regions. Its class-leading Phoma stem canker resistance is based on a combination of single and multigene resistance. Fungicide product choice, doses and timings can therefore be targeted to control Light leaf spot and such treatments will act as a back up to Harper's genetic resistance for Phoma control. Usually a single autumn application will suffice, provided the Phoma leaf spot level stays below threshold.

Harper - Management 2017

Higher scores reflect that the variety shows the characteristic to a higher degree. Data extracted from AHDB RL 2017/18 (E/W). DK Extrovert from

Performance and income

Harper is valued by growers for delivering consistent on-farm performance year after year.

Whilst it no longer tops the RL in gross output terms, Harper has demonstrated highly consistent gross output performance in RL trials across the past 4, very different years driven by its strong agronomic package and can therefore be described as a low risk option. Whilst some of the newer, high yielding varieties have great yield potential, analysis of yield performance from year to year shows huge variation, making them a high risk option for growers.

Harper - Performance 2017Data extracted from AHDB RL 2017/18 (E/W)

Where to buy our seed

Below you will find where Harper is available to purchase

Woodheads seeds