Variety traits
Lolium perenne L.
The winter hardiness of perennial ryegrass is limited by the shallow depth of the tillering node and susceptibility to temperatures below -20 °C in the absence of snow cover. The crop's low adaptability to severe winters leads to stand thinning and reduced longevity of the sward.
In the reference 120 varieties crop Perennial ryegrass, where this is mentioned in the description.
A critical factor in the winterkilling of perennial ryegrass is the location of the tillering node at a depth of only 8–13 mm from the soil surface, a depth which tends to decrease as the stand matures. The crop does not tolerate snowless winters or late spring frosts well, which can lead to mass plant loss in unfavorable conditions as early as the first year of growth.
In breeding and variety testing, winter hardiness is assessed visually on a 5-point scale before winter dormancy and after spring regrowth. Additionally, instrumental methods are used, such as counting shoot density per unit area after wintering or laboratory freezing of plants in chambers followed by an assessment of the percentage of surviving shoots 14 days after thawing.
Due to its lower winter hardiness compared to other forage grasses, such as fescue, perennial ryegrass is often used in grass mixtures in limited proportions (no more than 25–30%) to prevent total loss of cover in the event of plant death. Its tendency to winterkill must be taken into account when planning the longevity of pastures and turf covers.
General information about the subject — on the page Winter hardiness.
Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.
Lolium perenne L. · Perennial ryegrass
STELLING DIETER
Lolium perenne L. · Perennial ryegrass
STELLING DIETER
Lolium perenne L. · Perennial ryegrass
DLF Seeds A/S
Lolium perenne L. · Perennial ryegrass
Wilbert Luesink^^^Martin Frauen
Lolium perenne L. · Perennial ryegrass
MOMMERSTEEG INTERNATIONAL| Mommersteeg International B.V.
Lolium perenne L. · Perennial ryegrass
Barenbrug Holland BV, 6501 BH Nijmegen
Lolium perenne L. · Perennial ryegrass
VIJN| R. Vijn c/o Cebeco Seeds B.V.
Lolium perenne L. · Perennial ryegrass
RIJKSTATION VOOR PLANTEFOR
Lolium perenne L. · Perennial ryegrass
DLF Seeds A-S, DK
Lolium perenne L. · Perennial ryegrass
Euro Grass Breeding GmbH Co. KG
Lolium perenne L. · Perennial ryegrass
Freudenberger, D
Lolium perenne L. · Perennial ryegrass
The State University of New Jersey - Rutgers (US)
Lolium perenne L. · Perennial ryegrass
Innoseeds B.V.
Lolium perenne L. · Perennial ryegrass
DLF-Seeds A/S
Lolium perenne L. · Perennial ryegrass
D.J.VAN DER HAVE
Lolium perenne L. · Perennial ryegrass
DLF Seeds A/S, 4000 Roskilde
Lolium perenne L. · Perennial ryegrass
Rijksstation Voor Plantenveredeling (BE)
Lolium perenne L. · Perennial ryegrass
M. Francois Charpentier c/o REGA
Lolium perenne L. · Perennial ryegrass
Steve Reid
Lolium perenne L. · Perennial ryegrass
DLF Seeds A/S, 4000 Roskilde
Lolium perenne L. · Perennial ryegrass
SEMENCES DE FRANCE
Lolium perenne L. · Perennial ryegrass
Jan Wojciech Kaszuba / Anna Ostrowska
Lolium perenne L. · Perennial ryegrass
PRODANA| Prodana Seeds A/S
Lolium perenne L. · Perennial ryegrass
Norddeutsche Pflanzenzucht Hans-Georg Lembke KG