Gadenin日本語Get the appThe flowers are switched by sunlight, not by time of day
Each flower is a low daisy-like disc of narrow glistening petals, usually with a dark ring around a paler center. It opens when strong direct light falls on it, generally within an hour or two of the sun reaching the plant, and closes again as the light goes. On a bright day in an open position that means open from mid morning until late afternoon. On an overcast day the same plant may not open at all.
This is normal and it cannot be trained out of the plant. It is a desert habit that protects the pollen from rain and from wasted exposure on days when nothing is flying. What it means for you is simple and unforgiving: the display exists only where there is real sun. A patch in a place that is merely bright will be green and healthy and almost permanently shut.
The practical consequence is that you should judge a planting by how it looks at midday on a clear day, not by how it looks in the evening when you get home. If a patch is shut at one in the afternoon under a clear sky, the problem is the position or the plant, not the hour.
Reading a closed patch
Before you change anything, work out which of the two problems you have. Closed flowers mean the buds are there but not opening, and that is nearly always a light problem. No flowers at all means the plant is not producing buds, and that is nearly always a soil or nutrition problem. Kneel down and look into the mat: if you can see plenty of pointed unopened buds, you are in the first case.
The table below covers what you will actually see. Work through it in order, because the light causes are far more common than everything else combined, and moving the plant is often the entire fix.
| What you see | Likely cause | What to do |
|---|---|---|
| Buds present, shut all day under cloud | Normal behavior | Nothing; they will open on the next clear day |
| Buds present, open only for an hour or two | Site loses direct sun early | Move or replant into an open spot for next season |
| Buds present, never open even in sun | Overhead shade from taller neighbors | Cut back or remove what is casting the shade |
| Lush green mat, very few buds | Soil too rich or fed with nitrogen | Stop feeding and watering; growth will harden and set buds |
| Thin sprawling stems, flowers only at the tips | Crowding, or the plant is past its first flush | Shear back by a third on a dry morning |
| Flowering stops abruptly in a cool spell | Night temperatures have fallen | Wait for warmth; nothing to correct |
The causes of genuinely shy flowering
Rich ground is the commonest reason for a plant that grows well and refuses to bloom. Livingstone daisy sets buds under mild stress, and comfortable conditions keep it in leaf. If you have planted into improved border soil, or if the plant is still living in the rich mix it was raised in at the nursery, it will make a handsome green cushion and very little else. The remedy is to withdraw everything: no feed, minimal water, and if it is early enough in the season, lift and replant into gritty ground.
Crowding is the second cause. Plants set closer than about six inches (15 cm) shade each other's centers as they spread, and a shaded center stops producing buds even when the tips are still flowering. Thin generously at the seedling stage rather than trying to correct this later, and remember that each plant will cover eight to twelve inches (20 to 30 cm) by midsummer.
Cold is the third. Below about 60F (15C) by day the plant slows and the flowers stay tight, and a cool cloudy week in early summer can stall a young planting entirely. This corrects itself and needs no action, but it does mean there is no advantage in planting out early. A plant set out into cold ground flowers no sooner than one set out a fortnight later into warm ground.
Getting more out of the flowering weeks
There are only three interventions worth making, and none of them involve feeding. Pinch the growing tips out once, about two weeks after the young plants have started growing away, to force branching. A branched plant carries several times the flowers of an unpinched one, and the pinch costs you nothing but a few days.
Shear the whole planting back by about a third when the first flush thins, choosing a warm dry morning. Expect the plant to look bare for a week or so and then to come back thicker. In a long hot season you can do this twice, and the second flush will run on until the weather cools.
Finally, keep the ground around the plants bare and open. Do not mulch with compost or bark, which holds damp against the low stems. If you want a mulch, use gravel or coarse grit; it keeps the plant dry, reflects heat and light up into the flowers, and suits the way the plant is meant to grow.
Do not deadhead individual flowers. Each bloom lasts a day or two and the spent petals shrivel to almost nothing. Picking them off is wasted effort and risks bruising the soft stems, which is an entry point for rot.
After the flowering, and what to record
Flowering ends when the nights cool rather than gradually fading, and the first real frost kills the plant outright. Before that happens, leave a few of the last flowers to run to seed if you want plants next year; the small capsules split when they dry and shed fine seed exactly where the plant grew, which is usually where it will grow best again.
Record the date the first flower opened and the date the display was clearly finished, along with a note on the position. Over two seasons those two dates, set against where each patch was planted, will tell you which corners of your garden are genuinely hot enough. Also note the day and hour at which each patch closed on a clear day, because that single observation identifies a spot that is losing its sun earlier than you thought.
If a patch was disappointing, write down what the soil was like when you dug it and whether anything was fed nearby. Nine times out of ten a shy-flowering patch has an obvious explanation in the notes and no explanation at all in the memory.