Gadenin日本語Get the appIt is a prairie plant, not a border perennial
Echinacea evolved on open grassland with full sun, wind, poor stony soil and a long dry summer. Every instinct a gardener has about being kind to a perennial works against it. Rich soil, heavy mulch up against the crown, generous feeding and a sprinkler running twice a week will give you a tall floppy plant with soft growth that flops in the first storm and rots at the base in its second winter.
The single best thing you can do for coneflower is decide, before you plant it, that you will underdo it. Full sun for at least six hours a day, soil that drains fast enough that water never stands after rain, no feeding beyond a thin top dressing of compost, and watering only when the plant asks. Treated that way, a plant settles in over two seasons and then holds for years with essentially no work.
If your border is rich, moist and half shaded, coneflower is not the plant to force into it. Put it on the sunniest, driest, meanest corner you have and it will outperform the pampered clump every time.
Water only when the plant tells you to
In its first season a new plant has a shallow root system and does need help. Soak it deeply once a week through its first summer unless rain has done the job, and let the top two inches (5 cm) dry out between soakings. Deep infrequent watering drives the taproot down; a daily sprinkle keeps roots near the surface and produces a plant that will never be drought-proof.
From the second season on, an established plant in the ground rarely needs watering at all. It wilts visibly in the heat of a hot afternoon and recovers by evening, and that afternoon wilt is not a call for water. Only water when the leaves are still limp the following morning, and then soak the root zone properly rather than wetting the surface.
Plants in pots are the exception. A container has no reserve, and coneflower in a pot dries out fast in summer heat. Check by weight rather than by looking, water until it runs from the base, and never leave the pot standing in a saucer of water.
| Situation | Watering | Why |
|---|---|---|
| First season, in ground | Deep soak weekly if no rain | Roots are shallow and cannot yet find water |
| Established, in ground | Rarely, only after a long drought | Deep taproot reaches moisture on its own |
| In a container | When the pot feels light, often twice a week in heat | No soil reserve to draw on |
| Autumn and winter | None at all | Wet cold soil around the crown is what kills plants |
Feeding, and why almost none is right
Coneflower does not want a feeding program. A thin layer of garden compost spread around the plant in spring, kept an inch (2 to 3 cm) clear of the crown itself, is the whole of it. Nitrogen-heavy fertilizer produces tall, soft, dark green stems with big leaves and disappointing flowers, and those soft stems are the ones that snap and flop.
If your plants are flopping and you have been feeding them, stop feeding for a full season before you reach for stakes. Most flopping coneflower is overfed or under-lit rather than genuinely in need of support. The plants that lean are usually the ones nearest a fence or a shrub, reaching for light.
Spacing, air and staking
Give each plant 18 to 24 inches (45 to 60 cm) of room. It feels wasteful the first year when the plants are small, and it pays for itself from the second year on: air moving between the clumps is the cheapest powdery mildew control there is, and crowded plants are the ones that get leaf spot in a humid summer.
A well-grown plant in full sun on lean soil should stand on its own at 24 to 40 inches (60 to 100 cm) without staking. If you do need support, put a few twiggy branches or a low ring in place in late spring while the stems are still short and let the plant grow up through it. Trying to gather a flopped clump into a stake after it has fallen never looks right.
Keep a record while the plant is still small
Coneflower changes a lot between its first and third seasons, and by the time it matters you will have forgotten what you did. Write down where each plant went, whether it was raised from seed or bought as a potted plant, and what the soil in that spot is like. Note the date the first flower opened each year and the date the last one faded.
Two records repay themselves quickly. The first is which plants came through winter and which vanished, together with how wet that spot stays after heavy rain, because the pattern will show you exactly which corners of your garden are safe for coneflower. The second is the date the first flower opened, because a plant that opens two weeks later each year is telling you it is being shaded out by something that has grown up beside it.