Gadenin日本語Get the appKeep it cool for as long as you possibly can
Everything about freesia care runs downhill once the plant gets warm. Cool nights below about 60F (15C) keep the leaves short and stiff, the stems thick, and the flower spike developing. Warm nights make the leaves long and slack, the stems thin, and the flowers small or absent. So the first act of care every day, in effect, is deciding where the pot stands, and the answer is almost always the coolest bright place available.
Daytime sun is welcome. A pot in an unheated greenhouse that reaches 70F (21C) in the afternoon and drops to 45F (7C) at night is in near perfect conditions. The same pot in a living room at a steady 68F (20C) day and night is in bad ones, even though the average is similar. It is the drop that matters.
Once the flower spikes are visible and coloring, a spell of warmth does much less harm, and moving a pot indoors to enjoy the scent for a week is a reasonable trade. Move it back out to the cool afterwards and the remaining buds will open more slowly and last longer.
Watering: steady while growing, then progressively less
In full growth freesia is thirsty relative to its size. The root system is small and a crowded pot dries fast, so during the main growing weeks check daily and water whenever the top inch (2.5 cm) is dry. Water at the compost surface rather than over the leaves; water sitting in the crowded base of a clump invites rot and marks the flowers.
The rhythm changes three times through the season, and getting those changes right matters more than the exact frequency. Slow at the start, generous through growth and flowering, then a deliberate drying off once the leaves begin to yellow. That last step is not neglect; it is what ripens the corm for next year.
| Stage | How to water | Signs you have it wrong |
|---|---|---|
| Planted, no shoots | One soak, then only when the pot is light | Soft corms, sour smell, nothing emerging |
| Shoots to 6 in (15 cm) | When the top inch (2.5 cm) is dry | Yellow lower leaves, or stretched pale growth |
| Bud to full flower | Keep evenly moist, check daily | Buds drying and failing to open |
| Flowers over, leaves green | Continue normally, do not stop yet | Early leaf collapse and small corms next year |
| Leaves yellowing | Reduce steadily, then stop | Rot in storage, or corms that break dormancy early |
Feed for stems and flowers, not for leaves
A high-nitrogen feed produces exactly what you do not want: more long soft leaves that flop harder. Use a high-potassium liquid feed, the same kind sold for tomatoes, diluted as directed and given every two weeks from the point where shoots are about four inches (10 cm) tall. Continue through flowering and, importantly, for four to six weeks after the last flower fades, because that is when the new corm is being built.
In open ground on reasonable soil, freesia often needs no feeding at all in its first season. In pots it always does, because the compost is exhausted by the time the flower spike forms and the plant has nowhere else to draw from.
The flopping is normal, and support has to go in early
Freesia leaves are narrow, upright and unbranched, and stems carrying a one-sided spike of buds become top heavy exactly when they matter. Left alone the whole clump splays outward from the center and the flower spikes end up horizontal, resting on the soil where they mark and rot. This is not a fault of the growing; it happens to well-grown plants and it happens harder to well-fed ones.
The support that works is one that disappears. Thin twiggy prunings pushed in around the pot edge while the shoots are short let the leaves grow up through them and become invisible within a fortnight. A ring of four short split canes with a loop of soft twine at about two thirds of the eventual height does the same job more tidily. What does not work is tying stems individually after they have fallen; the bend stays, and a tied bundle of freesia looks like a bundle.
In a bed, plant in a block rather than a row and let the plants hold each other, with a few twigs through the middle. A single line of freesia along a path edge will lie down on the path.
Set the support height to roughly two thirds of the expected final height, around 10-12 in (25-30 cm) for most plantings. Support set too high looks like scaffolding, and support set too low lets the stems bend over the top of it.
What to record while the plant is growing
Note the date the first flower opened and where the pot was standing, along with a rough night temperature for the preceding weeks if you can. Freesia rewards this more than most plants because the link between cool nights and flowering is so direct that a season's notes usually explain the result outright.
Also record the final height and whether the support held. Height varies a lot with light and warmth, and knowing that last year's pot in a particular spot reached fourteen inches (35 cm) tells you exactly how tall to build the support this year rather than guessing again.