Bulletin #2262, Forage Facts: Growing Forage Grasses in Maine

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Developed by Timothy S. Griffin, Extension Sustainable Agriculture Specialist
Reviewed and updated by Donna Coffin, Extension Professor, University of Maine Cooperative Extension

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Table of Contents:

Livestock production in Maine, whether dairy, beef or sheep, depends on forage crops. Some forages are grown as hay, some as silage, and others are grazed. To get the most out of the forage crop, you need to know which forages are on your farm and how to manage them. This fact sheet describes management and productivity of the five forage grasses commonly grown in Maine: Kentucky bluegrass, timothy, orchardgrass, and smooth bromegrass.

Kentucky Bluegrass
(Poa pratensis L.)

Kentucky BluebgrassGrowth Habit and Appearance: Bluegrass is a short grass (six to 12 inches tall) that forms a dense sod by underground stems called rhizomes. The leaves are quite narrow, and the leaf tips are “boat-shaped.” Most of the leaves are near the ground rather than high up the stem. Fine stems are produced mainly in the spring. The seedhead is an open, loose triangle.

Adaptation: Kentucky bluegrass (which may also be called Junegrass) is found across New England in both pastures and lawns. In pastures, it rarely needs to be seeded and will tolerate a wide range of soil conditions. High temperatures and low soil moisture during July and August may cause growth to stop completely. Because of its low growth habit, bluegrass dominates pastures that are grazed continuously during the growing season. Bluegrass grows back easily, even with frequent cutting or grazing. This is one reason it is so popular as turf grass.

Productivity: The yield and palatability of Kentucky bluegrass are good in the spring, but the yield is generally quite low; low enough that it is rarely worth harvesting other than by grazing. Bluegrass flowers in late May to mid-June if it is not cut or grazed, but it will keep producing leaves all summer if it is grazed continuously.

Management Recommendations: Bluegrass does not respond well to nitrogen (N), phosphorous (P), or lime. Yields will still be low even if you fertilize it. If land or fencing costs are high, improvements on Kentucky bluegrass pastures may not be economical. In pastures where bluegrass dominates, it is usually a result of continuous, season-long grazing.

(Phleum pratense L.)

Timothy grassGrowth Habit and Appearance: Timothy grows in clumps or bunches. It is generally two to four feet tall at maturity. Leaves are smooth, flat and have distinct veins. The seedhead is a tight cylinder. This grass reproduces from corms or bulbs at the base of the stem, just below the soil surface. It may be confused with meadow foxtail, a weedy pasture grass.

Adaptation: Timothy is well-adapted to New England and is probably the most popular forage grass in the area, although there are more acres of bluegrass. It grows well in the moderately to imperfectly drained soils common in Maine. However, the yield will be low, and the stand will die out faster on either droughty or wet soils. It prefers a soil pH range from 5.6 to nearly 7.0.

Productivity: Timothy is productive under two-cut hay systems or a one-cut system followed by a late summer or fall grazing. It does not survive well under more intensive harvest systems (three or more harvests per year). Hay yield is low and regrowth is slow in dry weather because of a shallow root system, and/or if fertility is poor. Like most cool-season grasses, it responds well to nitrogen, either as fertilizer or manure. Annual yield is moderate (two tons hay/acre) but can be increased if well managed.

Management Recommendations: Timothy is well-suited for grass-legume mixtures, and is most commonly grown with clovers. In general, mixtures with alfalfa are difficult to manage because alfalfa tolerates more frequent harvests than timothy. In Maine, timothy produces seedheads from mid-June to early July. The quality of the forage is very good in late boot to early head stages but drops after heading. When harvested early, palatability is good for all classes of livestock. Improved varieties are available depending on the management system. ‘Climax’ flowers later than common timothy. ‘Chazy’ is compatible with alfalfa in a mixture. ‘Richmond’ and ‘Toro’ flower early but have better regrowth potential.

(Dactylis glomerata L.)

Growth Habit and Appearance: Orchardgrass is a tall, cool-season grass that grows in clumps or bunches. The leaves are folded when young and often form a V-shaped trough. The seedhead is roughly triangular, with seeds produced in bunches. Before flowering, the base of the shoot is very flat.

Adaptation: Orchardgrass requires well-drained, fertile soils for high yields. It also requires good surface drainage because it doesn’t tolerate winter icing. There have been many reports of winterkill in Maine on soils that are poorly or somewhat poorly drained. It is less winterhardy than timothy, so expect stands to be shorter lived. Optimum soil pH range is from 5.8 to 6.8.

Productivity: Orchardgrass is a leafy, fast-growing grass with high yield potential. It flowers earlier than timothy (early to mid-June), but regrowth and summer growth is better. It also responds well to nitrogen fertilizer if pH or other nutrients do not limit growth.

Management Recommendations: Orchardgrass can be seeded alone or with a legume. Alfalfa is the preferred legume because both orchardgrass and alfalfa require good drainage, grow upright, are equally competitive when fertility is good, and regrow at a similar rate. Other legumes are not able to compete with orchardgrass. To get high yields, make sure that soil phosphorous (P) and potassium (K) are suitable for both alfalfa and orchardgrass. Soil pH should be 6.2 or higher. If orchardgrass is grown alone, nitrogen should be applied to early spring growth and will probably be needed after each harvest. This grass grows well when harvested for hay or silage, and in a rotational grazing system. Stands will die out if it is grazed continuously.

Orchardgrass flowers in late May to early June. The quality drops quickly after flowering. Thus, it should be used in hay fields or pastures where early harvest (late boot to the early head stage) is possible. Improved varieties like ‘Pennlate’ and ‘Rancho’ flower later than common orchardgrass and should definitely be used in new seedings.

Smooth Bromegrass
(Bromus inermis Leyss.)

Smooth BromegrassGrowth Habit and Appearance: Smooth bromegrass is a tall, sod-forming perennial grass that spreads by short rhizomes. Leaves typically attach to the stem at a sharp, upright angle and the leaf sheath (the part that wraps around the stem) is closed or continuous. The leaves have a tightened section shaped like the letter “M” about two-thirds of the way to the leaf tip.

Adaptation: This grass is well-adapted to the climate of the northern United States, from Washington to Maine. It is more winterhardy than orchardgrass across this range. Smooth bromegrass will tolerate extremes in temperature and periods of drought, during which it simply stops growing. It is commonly grown as hay or silage with a legume like alfalfa or red clover, where it spreads out as the legume dies. It can also be grown alone if nitrogen fertility is maintained. It is not widely grown in Maine because it requires well-drained, deep soils similar to those required by alfalfa.

Productivity: During spring growth, smooth bromegrass yield is equal to or greater than that of orchardgrass, providing high-quality forage as pasture, hay or silage. If grown in pure stands, nitrogen fertilizer or manure applications will prevent it from becoming sod-bound. Regrowth after harvest is much slower than orchardgrass; this is considered a major disadvantage of smooth bromegrass (see Management Recommendations section). Like other grasses, the quality of smooth bromegrass drops quickly after seedheads are formed.

Management Recommendations: Harvest management of smooth bromegrass is important because of its slow regrowth potential. Harvest, by grazing or machine, removes most of the growing points, and new tillers or stems must be started from buds on the crown.

Before the seedhead is formed, the plant is using carbohydrate reserves (“fuel”) for growth; if it is cut during this time, reserves available to start regrowth are low, and there is a greater chance that the plant will not survive. This is especially true for the first harvest of the year. For these reasons, early harvest or early grazing should be avoided if possible to maintain the stand.

Like timothy, the variety of smooth bromegrass you choose depends on how you will use this grass. Some varieties, like ‘Saratoga,’ have been developed for better regrowth. Smooth bromegrass-alfalfa mixtures are widely used, with ‘York’ smooth bromegrass being well-adapted for this use. However, remember that alfalfa regrows faster than bromegrass, and the grass will do poorly if harvested three or more times per year.

The four kinds of grass listed in this fact sheet are the most commonly used forage grasses in Maine. Under specific situations, several other kinds of grass (like tall fescue or perennial ryegrass) may be used, but their adaptation to Maine conditions is uncertain. When you select grasses for hay or pasture, your choice is based on many factors, like soil fertility and harvest management. Grass production over a period of years also requires that you pay attention to these factors after seeding these grasses.

Table 1. Rates for seeding grasses alone and in mixtures

Seeding Rate, lb/acre
Grass species Seeded alone Seeded in mixture
Kentucky Bluegrass* 5–10 5–10
Timothy 8 4–6**
Orchardgrass 10–12 2–3**
Smooth Bromegrass 15 4–6**
* Seeding of bluegrass is not usually required.
** Use low rate for seeding with slow-growing legume like birdsfoot trefoil, high rate for seeding with competitive legume like alfalfa.

Table 2. Forage grasses at a glance

Kentucky Bluegrass Timothy Orchardgrass Smooth Bromegrass
Drainage Poor to well drained Moderate to imperfect; avoid droughty soils Moderate to imperfect; good surface drainage Well-drained
Winterhardiness Good Good Fair; variable Fair to good
Nitrogen Response Fair Fair to good Good Good
Cuttings/Year ———- 1 to 2 2 to 3 2
Summer Growth Fair; poor during hot weather Fair Good Variable
Suitability for:
Continuous Grazing Good Fair to poor Poor Poor
Moderate Rotations Poor Fair Fair Good
Intensive Rotations Poor Poor Good Fair to poor

VIDEO: How To Test Forage Quality (YouTube)
VIDEO: How To Frost Seed (YouTube)

For more information about forage crops, contact your local UMaine Extension County Office.


The drawings were reproduced from Identification of Grasses and Legumes, Publication No. AG-30-S, University of Missouri-Columbia. Permission from the Instructional Materials Laboratory at the University of Missouri-Columbia and from Mrs. H.B. Hartwig.

Information in this publication is provided purely for educational purposes. No responsibility is assumed for any problems associated with the use of products or services mentioned. No endorsement of products or companies is intended, nor is criticism of unnamed products or companies implied.

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