Italian & biennial Ryegrasses

IH Seeds italian & biennial ryegrasses: 3 lines in our range. Our italian & biennial ryegrasses range has 3 lines, covering biennial and annual types. Individual lines suit areas from 400 mm up to 600 mm or more of annual rainfall. Soils range from sand to heavy. Common uses are grazing, hay and silage. Suitable livestock include beef, dairy, sheep and equine.

Italian & biennial

In stock

Achieve Diploid Italian Ryegrass

Italian & biennial

Improved winter production and faster establishment

DiploidMid-late450 mm+

In stock

Amass Tetraploid Italian Ryegrass

Italian & biennial

Late heading, big producer into winter and spring

TetraploidMid-late600 mm+

In stock

Dargo Diploid Italian Ryegrass

Italian & biennial

Highly proven from Esperance to Geraldton

DiploidEarly400 mm+

Name	Sub-category	Stock	Min Rainfall	Soil Range	pH	Sowing Rate	Tolerances
Achieve Diploid Italian Ryegrass	Italian & biennial	In stock	450 mm+	S–H	5 CaCl₂	20–25 kg/ha	Mild P / W
Amass Tetraploid Italian Ryegrass	Italian & biennial	In stock	600 mm+	S–H	5 CaCl₂	25–35 kg/ha	Mild P / W
Dargo Diploid Italian Ryegrass	Italian & biennial	In stock	400 mm+	S–H	5 CaCl₂	15–30 kg/ha	Mild S

Choosing Italian & biennial Ryegrasses

Our italian & biennial ryegrasses range has 3 lines, covering biennial and annual types. Individual lines suit areas from 400 mm up to 600 mm or more of annual rainfall. Soils range from sand to heavy. Common uses are grazing, hay and silage. Suitable livestock include beef, dairy, sheep and equine.

Type & persistency: Biennial, Annual
Rainfall: 400–600 mm+ annual rainfall, depending on variety
Soil range: Sand to Heavy
Soil pH: pH 5+ (CaCl₂)
Sowing rate: 15–35 kg/ha
Tolerances: Low pH (2), Waterlogging (2), Salinity (1)
End use: Grazing (3), Hay (3), Silage (3)
Livestock: Beef (2), Dairy (2), Sheep (2), Equine (2)
Ploidy: Diploid, Tetraploid
Heading date: Early, Mid-late

Compare italian & biennial ryegrasses at a glance

Italian & biennial Ryegrasses: key differences between lines
Product	Persistency	Ploidy	Heading date	Min rainfall
Achieve Diploid Italian Ryegrass	Biennial	Diploid	Mid-late	450 mm+
Amass Tetraploid Italian Ryegrass	Biennial	Tetraploid	Mid-late	600 mm+
Dargo Diploid Italian Ryegrass	Annual	Diploid	Early	400 mm+

Match a paddock to the right seed with the Pasture Selector or read the seed guide. Also see all Ryegrasses, Annual tetraploid, Perennial & hybrid and Annual diploid.

2026 Pasture Seed Guide

Every line in this category, with sowing rates and regional notes.

Download the 2026 Pasture Seed Guide (PDF)