Plant problems

Why Are My Vulpia Leaves Curling?

Q: How do I grow vulpia in a UK garden?

Vulpia species (rat's tail fescue, squirrel-tail fescue) are best grown in a UK garden from seed sown directly in the position where they are to grow, in autumn (September to October) or early spring (February to March), in a sunny, very freely draining position in light, sandy, very low-fertility soil or in a container or raised bed filled with a very free-draining, gritty, low-nutrient mix. They perform well in a gravel garden, a sunny wall crevice, a railway-sleeper or stone raised bed, or in a container of equal parts horticultural grit and low-nutrient compost. In heavy, moist, fertile garden soil, vulpia rarely performs well; the fine annual roots are quickly damaged by persistent moisture and excessive nutrients. Sow thinly on the surface or barely cover the fine seed; vulpia needs good light contact with the soil to germinate and the seedlings are very delicate. Thin or separate seedlings as needed; each plant develops into a small, fine-leaved tuft in spring. Do not water unless the soil is completely dry; vulpia is adapted to dry conditions and overwatering is the most common cause of failure. Do not feed. The main display is the cloud of fine, long-awned spike-like seed heads produced from April to June; the seed heads can be cut and dried at this stage for use in dried flower arrangements. Plants die after seeding in June to July; collect seed for resowing the following autumn, or allow self-seeding in suitable open, dry, gritty conditions.

Q: Is vulpia good for dried flower arrangements?

Yes, Vulpia myuros (rat's tail fescue) is an excellent annual grass for drying and use in dried flower arrangements and botanical craft; the long-awned, spike-like, delicate seed heads maintain their fine structure and pale, straw-yellow colour very well when dried, and the characteristic long awns (the hair-like bristles extending from each individual spikelet) give the dried heads an unusually fine, almost hair-like texture that is quite different from the bolder, rounder seed heads of most ornamental grasses used in dried arrangements. The dried seed heads of Vulpia myuros are used commercially in dried grass and wildflower bunches and are available from a small number of UK dried flower and botanical suppliers, though growing your own from a direct sowing in dry, gritty conditions is straightforward and produces the same fine material. For the best results in cutting and drying, cut the stems when the seed heads are fully developed but before the seed begins to shatter (typically in late April to late May in a UK garden); hang in small, loose bunches in a warm, dry, airy position out of direct light for two to three weeks. The natural straw-yellow to pale buff colour of the dried vulpia seed heads coordinates well with dried wildflower material from the same season (dried Aira elegantissima, dried Briza media (quaking grass), dried Agrostis capillaris) for naturalistic, wildflower-style dried arrangements. Vulpia myuros is sometimes included in commercial wildflower meadow cutting-garden seed mixes precisely for this dried flower use.

Q: Is vulpia native to the UK?

Yes, several vulpia species are native to the UK or have a long-established presence as archaeophytes (plants introduced before 1500 CE that are now considered part of the established UK flora). Vulpia bromoides (squirrel-tail fescue, barren fescue) is a native or long-established UK species found on dry sandy grassland, heathland paths, wall tops, and other dry, open, low-fertility habitats across much of England and Wales; it is more common in the south and east of England. Vulpia myuros (rat's tail fescue) is a species of uncertain native status in the UK (possibly a long-established introduction in some habitats, possibly native in some dry sandy southern UK habitats) that has expanded significantly in the twentieth century and now occurs abundantly on railway ballast, dry roadsides, urban pavement cracks, and disturbed dry ground across much of southern England, with a strong association with urban and post-industrial habitats. Vulpia fasciculata (dune fescue) is a native UK coastal grass of fixed and semi-fixed sand dunes, particularly in south Wales, south-west England, and parts of the east coast of England and Scotland, where it is a characteristic species of the open, dry, low-fertility conditions of the sand dune system. The various UK vulpia species are components of the dry, open grassland and sand dune habitats that have declined significantly in the UK through agricultural intensification, urban development, and scrub encroachment, and are used in grassland restoration seed mixtures appropriate to their habitat types.

Vulpia myuros (rat's tail fescue) and V. bromoides (squirrel-tail fescue) are delicate annual or biennial grasses with fine, hair-like leaves and distinctive long-awned, spike-like seed heads from April to June. Specialists of dry, sandy, impoverished ground. Overwatering and heavy, fertile soil are the most common problems; summer die-back after seeding is normal annual lifecycle behaviour.

Overwatering and wet soil

Vulpia is an extreme specialist of dry, open, freely draining conditions; in heavy, moisture-retentive, or frequently watered soil, the fine annual roots succumb to rot and the plant collapses and yellows before completing its life cycle and producing the characteristic long-awned seed heads. Overwatering in a container is the most common single cause of failure; the annual root system has no tolerance for persistent moisture.

What to do

Grow in very freely draining, light, sandy, or gritty soil; in a gravel garden, wall crevice, or raised bed of equal parts horticultural grit and low-nutrient compost. Do not water unless the soil is completely dry; vulpia is adapted to extended dry periods and requires less water than almost any other UK garden grass. In a container, ensure drainage holes are fully open; raise the container on feet to improve air circulation under the base.

Too much fertility

Vulpia grows in the most nutrient-poor, impoverished habitats available (dry sandy roadsides, wall tops, railway ballast, sand dunes); in a fertile garden border or in a fertilised container, plants are outcompeted by vigorous weed species or produce excessive soft foliage at the expense of the fine, delicate seed head display. Standard potting compost with added fertiliser is too rich for vulpia.

What to do

Do not add fertiliser or enriched compost. Use a low-nutrient, free-draining mix of grit and minimal compost in containers. In a border soil, vulpia is best on areas of naturally poor, thin, dry, sandy, or gravelly soil that have not been enriched; it is not a plant for an improved, cultivated garden border but rather for the kind of neglected, dry, open, sunny ground that many garden plants find too poor to thrive.

Normal summer die-back

Most vulpia species in UK conditions are winter annuals: they germinate in autumn, overwinter as fine vegetative growth, flower and set seed from April to June, then die as summer heat arrives. What appears to be curling and dying in June to July is often simply the plant completing its annual lifecycle. Collect seed for resowing in autumn, or allow self-seeding into open, dry, gritty ground.

What to do

Accept the annual lifecycle and collect ripe seed in May to June (when the awned seed heads begin to shatter) to resow in September to October for the following season's display. In a gravel garden or other open, dry, gritty condition, vulpia often self-seeds reliably without any intervention; the fine seed germinates readily on a bare, dry, gritty surface in autumn. The April to June seed head display is the main ornamental season; plan the surrounding planting to fill the gap that appears when vulpia dies back in July.

Frequently asked questions

Why are my vulpia leaves curling?

Vulpia leaves curl and die back most commonly because of overwatering or wet, heavy soil (extreme specialist of dry, freely draining, impoverished ground; fine roots rot quickly in persistent moisture; grow in grit-heavy, low-nutrient mix; water only when completely dry), too much fertility (nutrient-poor specialist; fertile soil produces soft foliage and few seed heads; no fertiliser; low-nutrient, gritty compost), or normal summer die-back after seeding (winter annual; germinates autumn; flowers April to June; dies in summer; collect seed for resowing; self-seeds in open, gritty conditions). Dry, gritty, impoverished conditions are the only requirement.

How do I grow vulpia in a UK garden?

Sow seed directly in autumn (September to October) or early spring (February to March) in a sunny, very freely draining, light, sandy, low-fertility position. Gravel garden, wall crevice, sunny raised bed, or container of equal parts horticultural grit and low-nutrient compost. Sow thinly on the surface. Do not water unless completely dry. Do not feed. Main display of fine, long-awned spike-like seed heads from April to June; cut for dried arrangements at this stage. Plants die after seeding in June to July; collect seed for resowing or allow self-seeding in open, gritty conditions.

Is vulpia good for dried flower arrangements?

Yes; the long-awned, spike-like seed heads of V. myuros (rat's tail fescue) maintain their fine structure and pale straw-yellow colour very well when dried. The long awns give an unusually fine, hair-like texture different from bolder ornamental grass seed heads. Cut when seed heads are fully developed but before seed shatters (late April to late May). Hang in small, loose bunches in a warm, dry, shaded, airy position for two to three weeks. Coordinates well in dried arrangements with Aira elegantissima, Briza media, and Agrostis capillaris. Used commercially in dried wildflower bunches.

Is vulpia native to the UK?

Yes; V. bromoides (squirrel-tail fescue) is native or long-established on dry sandy grassland, heathland paths, and wall tops across southern England. V. myuros (rat's tail fescue) has expanded significantly in the twentieth century and now occurs abundantly on railway ballast, dry roadsides, and urban pavement cracks across southern England. V. fasciculata (dune fescue) is a native UK coastal grass of fixed and semi-fixed sand dunes in south Wales, south-west England, and parts of the east coast. All are components of dry, open grassland and sand dune habitats that have declined through agricultural intensification and urban development.