Freesia aka Freesia

Freesias are compact cormous perennials, generally 10–50 cm (4–20 in) tall with a 6–12 in (15–30 cm) spread. NC State Extension and Missouri Botanical Garden put garden freesias at 12–18 in tall and 6–12 in wide, while RHS lists the genus at 0.1–0.5 m. Growth rate is described as medium, with stems emerging in autumn from the corm, building leaves through winter, and flowering in late winter to spring before going dormant.

Freesias are indigenous to eastern southern Africa, from Kenya south to the Cape Provinces of South Africa, with the majority of species concentrated in the Western and Eastern Cape. Freesia refracta is endemic to the Western Cape; F. corymbosa ranges through the Eastern Cape; F. leichtlinii subsp. alba is restricted to the southern Cape coast and has naturalised in Australia, France, California, and the Mediterranean Basin. F. laxa extends north as far as Kenya, the most tropical species in the genus.

Freesias need moderate, even moisture during active growth but excellent drainage at all times — they will not grow in wet compost and corms rot readily when overwatered. Missouri Botanical Garden classes water needs as medium, NC State Extension stresses good drainage, and the RHS specifically warns against soggy compost. Reduce watering as foliage yellows after flowering and keep corms dry during summer dormancy.

Plant freesias in a free-draining, sandy or grit-amended compost; the RHS recommends potting compost with added grit, and NC State Extension and Missouri Botanical Garden both highlight excellent drainage as the key to avoiding bulb decay. Heavy, moisture-retentive soils encourage corm rot and fungal dry rot.

Freesias prefer cool growing conditions, with daytime highs around 60–70°F (16–21°C) and noticeably cooler nights — too much warmth shortens flowering and weakens stems. They are frost-tender to half-hardy (USDA zone 9), so in colder climates they are grown as winter-flowering pot or greenhouse plants and the corms lifted for storage at the end of the season.

Freesias are winter-growing geophytes: they emerge in autumn, leaf through winter, flower in late winter to spring, and go dormant in summer. After flowering, allow the foliage to yellow and die back, then lift corms (or stop watering potted plants) and store in a cool, dry place until autumn.

Freesias are prized for their strong, sweet fragrance — many species and most modern cultivars are intensely fragrant, with Freesia leichtlinii subsp. alba reputed to have the strongest and sweetest scent of all freesias. The perfume is widely used in shampoos, hand creams, and candles.

Freesia flowers are carried in one-sided sprays of 5–10 narrowly funnel-shaped blooms at the tip of an arching stem. Wild species are typically white with purple or yellow markings (F. alba, F. leichtlinii subsp. alba) or highly variable red/white/pale blue (F. laxa); modern cultivars span white, yellow, orange, red, pink, lavender, purple, blue-mauve, and bicolours.

The cultivated florists' freesia descends from nineteenth-century crosses between Freesia refracta and Freesia leichtlinii, and Freesia alba in particular has been extensively hybridised, producing a wide array of variations in colour and form. The genus contains around six core species (including F. refracta, F. leichtlinii, F. alba, F. corymbosa, and F. laxa) and absorbs the former genus Anomatheca. Commercial production is concentrated in the Netherlands, where roughly 80 specialist growers supply the cut-flower trade.

Freesias can be grown outdoors year-round in USDA zones 9–10 and in the milder parts of the British Isles; elsewhere they are frost-tender and either lifted at the end of the season or grown as winter pot/greenhouse plants. Plant corms in a sunny, sheltered, well-drained spot — sunny patios, rock gardens, and bulbs sunk in seasonal beds all work well.

Plant freesia corms 1–2 in deep, around 6–8 corms per 6-inch pot, in a free-draining grit-amended potting compost. Fresh corms are typically planted from late August through December; SANBI notes a single pot fills with offsets within 2–3 years, so divide and repot once growth becomes congested, ideally during summer dormancy.

Freesias are readily increased from seed sown in autumn, with germination in 4–5 weeks, or from cormels detached during summer dormancy and replanted with fresh corms. Division of established clumps is also recommended by NC State Extension.

Foliage naturally yellows after flowering as the plant enters summer dormancy — at that point watering should be reduced and the corm allowed to dry. Out-of-season yellowing more often signals overwatering and incipient corm rot, since freesias will not tolerate wet compost.

Freesia stems are slender and arch under the weight of fully open flower spikes; weak, prematurely drooping stems usually point to too little light, temperatures too high, or saturated compost weakening the corm. Provide a bright, cool, airy spot and free-draining compost to keep stems upright.

Freesias grow at a moderate rate during their winter–spring active season; slow or stalled growth is typically caused by warm temperatures (above ~70°F days), insufficient light, or root/corm rot from overwatering. Cool nights, full sun to part shade, and free-draining compost reliably restore vigour.

The main pests are aphids (which can transmit viruses), thrips, slugs, and snails. Common diseases are bacterial leaf spot, iris leaf spot, fusarium wilt, and fungal dry rot of the corms; root and corm rot from overwatering is the single most frequent culprit.

In their native range freesias are mostly pollinated by solitary bees, and the foliage is also used as a larval food plant by some Lepidoptera species.

Beyond their value as a florists' cut flower (and a staple in wedding bouquets), freesias are an important fragrance source — their scent is used in hand creams, shampoos, perfumes, and candles.