Asparagus densiflorus Seeds | Foxtail Fern
LATIN NAME: Asparagus densiflorus
COMMON NAME: Foxtail Fern, Asparagus Fern
Plant Profile
The soft plumes that give foxtail fern its name are not leaves and not true needles. They are cladodes, flattened green stems that do the photosynthesising while the real leaves have shrunk to minute scales at their base. Massed along the arching branchlets, the cladodes read as feathery foliage, which is why the plant is sold as a fern even though it is a flowering asparagus cousin.
In summer the plant carries small white flowers where the cladodes meet the stem, and these ripen into round red berries, each holding a single hard seed. The berries are the only obvious clue to its kinship with garden asparagus, and they are the part you clean to sow, since the pulp around the seed blocks even sprouting.
Foxtail fern is often mixed up with asparagus fern and Sprenger fern, but its branchlets are denser and more bottlebrush-like, while Asparagus sprengeri trails in looser, open sprays and Asparagus setaceus is finely lacy. The tiered, tail-like density of densiflorus is the quick field mark when the three sit side by side in a nursery.
Nurseries multiply foxtail fern from shoot tips in culture because seed is slow and the plant does not divide neatly like a clump grass. A single clean shoot can yield hundreds of lined-out plants, which is how garden centres keep the benches full without waiting on berry crops.
Science & Biotechnology
Like other asparagus species, the crown and roots carry steroidal saponins, the compounds that give the genus its soapy, foaming roots and its long history in herbal trade. In foxtail fern those saponins sit in the tuberous rootstock rather than the plumes, and they are part of why the plant is decorative only and not a vegetable.
The root saponins of asparagus species have been screened for the same foaming and foam-stabilising behaviour that makes related roots useful in traditional washes. For densiflorus the interest is mostly chemical curiosity, since the plant is grown for the pot, but the chemistry still explains why every part smells faintly of raw asparagus when cut.
Uses & Benefits
Foxtail fern earns its keep as a hanging and basket plant that tolerates more shade than most ferns and shrugs off dry indoor air better than true ferns. The arching plumes spill from a pot or mound, and a single established clump gives a year-round green that asks little beyond occasional water.
Against true ferns it has one quiet advantage: no frond-drop mess and no demand for misting, so it suits a bright hallway or a forgetful windowsill where a maidenhair would curl. Give it a winter rest with less water and cooler air and the clump thickens instead of thinning, which is why old plants look better than new ones.
Florists value the plumes as a filler that holds shape and colour longer than most greenery, so a backyard clump can supply arrangements for weeks. Cut from the outer arch and the plant simply pushes more plumes from the crown, making it a quiet money crop for a home gardener.
The same long-lasting cut also makes foxtail fern a reliable piece for a church or a table that must look fresh for days, since the cladodes keep their colour long after a lily or a rose has faded. Strip the lower plumes and stand the stem in deep water, and the arch holds its line without a single wilted leaf to pick off.
The red berries are decorative but not food: the saponins that flavour the root also make the fruit bitter and upsetting raw. Enjoy them as colour on the plant, and keep them away from children and pets who might mistake the bright bead for something sweet.
Growing from Seed
Crush ripe berries and wash the pulp away, then sow the clean round seed on a warm, moist mix and keep it from drying. Fresh seed sprouts far better than stored, so sow within the season rather than holding the berries over.
Grow the seedlings in a sharp mix of sand and leaf mould that drains the moment you water, because the tuberous crown rots in heavy wet soil. A little lime and a bright, indirect spot are enough; full sun bleaches the plumes.
Move a crowded clump up a pot when it has thrown three flushes of new canes, teasing the tuberous roots apart rather than cutting them. Foxtail fern dislikes being split hard, so repot whole and let it fill the new pot on its own schedule.
Our Take
Foxtail fern is the asparagus you never eat but never regret planting, and it outlives almost every true fern on a sunny shelf. If you want the trailing kind for a hanging basket, the Sprenger asparagus fern (Asparagus sprengeri) and the lacy plumosus fern (Asparagus setaceus) are the natural next steps, while the medicinal Asparagus cochinchinensis shares the same tuberous root. Water the crown, not the plume, and it will run for years.
Related Reading
Gardeners who grow Foxtail Fern often pair it with these related subjects: