Gadenin日本語Get the appThe shape of the year
Bush clover runs on a simple annual cycle: reset in late winter, build all season, flower late, then stand through winter. Understanding that the flowers come at the end of the season on wood grown that same season explains every timing decision in the calendar, including why nearly all of the gardener's work happens before growth starts and almost none of it happens afterward.
This calendar is written in seasons rather than months so it reads the same in either hemisphere. Anchor it to two events you can observe in your own garden: the point in late winter when the ground begins to thaw and buds have not yet swollen, which is when you cut, and the first hard frost of fall, which ends the flowering season.
Note that the plant's behavior differs with climate. In cold regions it dies back to the ground each winter and behaves like a herbaceous perennial with woody stems. In mild regions more of the old wood survives, but you cut it off anyway, because keeping it produces a congested, bare-based shrub that flowers thinly and high up.
| Season | What the plant is doing | Your job |
|---|---|---|
| Late winter | Dormant, buds at the crown not yet moving | Cut the whole plant to four to eight inches (10 to 20 cm). Clear dead crown wood |
| Early spring | Shoots emerging from the crown | Refresh mulch off the stems. Pull self-sown seedlings. Plant new plants |
| Mid spring | Rapid stem extension | Set support hoops if the position is tight. Do not feed |
| Early summer | Stems lengthening and beginning to arch | Take softwood cuttings. Watch for aphids. Water new plants only |
| Midsummer | Full leaf, stems at close to final length | Nothing. No pruning of any kind. Check for mites in dry heat |
| Late summer | Flower buds forming and opening along the stems | Look at it. Deep-water container plants |
| Fall | Peak flowering, then pods forming | Cut spent flowering wands off before pods harden if seeding is a concern |
| Early winter | Leaves shed, stems dying back | Leave the stems standing. Do not cut. Do not feed |
Late winter and spring: the only busy weeks
The hard cut is the fixed point of the year. Do it after the worst of the cold and before the buds at the base begin to swell, taking every stem down to a short stub four to eight inches (10 to 20 cm) above the ground and removing any gray, hollow or soft wood from the crown entirely. On a plant older than about five years, also take out the oldest quarter of the woody stubs to keep young vigorous shoots coming from the outer crown.
Immediately afterward, while the plant is bare and the crown is visible, is the moment for anything structural: dividing a young plant, lifting and moving a plant that is in the wrong place or in ground that is too wet, or planting a new one once the soil has warmed past about 50F (10C). None of this is possible once the stems are up.
Through spring the main task is restraint. Refresh mulch to two inches (5 cm) with bark or gravel, pulled a hand's width back from the crown, and put support hoops in when the shoots are about a foot (30 cm) high if the plant grows in a confined border. Do not feed. Do not water an established plant. Spring is also the seedling patrol: walk the ground around the parent and pull every self-sown seedling while the roots are still shallow.
Summer and fall: leave it alone, then enjoy it
Summer is a season of watching rather than doing. The stems extend to four to six feet (1.2 to 1.8 m), arch outward under their own weight, and set the flower buds that will open at the end of the season. Every one of those stems is a flowering stem, so the single rule of summer is that you do not cut. A plant that looks untidy in midsummer is a plant that is preparing its display.
Early summer is the window for softwood cuttings, taken from soft non-flowering side shoots and rooted in a gritty mix at 65 to 75F (18 to 24C). Water only new plants and containers; an established plant in the ground needs the hose only in a genuine drought of six weeks or more, and then only one deep soaking. Check for spider mite stippling during hot dry spells and for aphids on soft tips earlier in the season.
Flowering runs from late summer through fall, small pea flowers in pink, rose-purple or white strung the whole length of the arching stems, until frost ends it. When flowering finishes, make the seed decision: in any region where the genus is invasive, cut the spent wands off before the pods dry and harden, and bin them rather than composting them. Otherwise leave everything standing.
Winter: doing nothing on purpose
Leave the dead stems standing through winter. This is a deliberate choice, not neglect. The standing stems trap leaves and snow around the crown, and that insulation is what protects the part of the plant that actually matters, since the top growth is expendable and will be cut off in a few weeks anyway. Cutting in fall removes the insulation and leaves fresh wounds at the crown to sit wet through the coldest months.
Bush clover is hardy through most temperate gardens, roughly to USDA zone 4 or 5 depending on species, and the limiting factor in practice is not cold but winter wet. A plant in sharply drained ground survives cold that would kill the same plant in heavy soil. If you garden on clay and are near the cold limit, a two-inch (5 cm) gravel mulch over the crown, pulled off in early spring, is worth more than any wrapping.
Container plants are the exception, because their roots have no soil mass around them and freeze far harder than the same plant in the ground. Move pots to the shelter of a wall, group them together, and stand them up off cold paving. In the coldest regions, sink the pot in the ground or move it to an unheated shed or cold frame for the depth of winter.
Do not wrap the top growth of a bush clover for winter. The stems are meant to die back and be removed in late winter. Wrapping traps moisture around the crown, which is the one part you are trying to keep dry.
The record that makes next year better
Keep four dates each year and you will have everything you need: the date of the hard cut, the date the first new shoot broke through, the date the first flower opened, and the date frost ended the display. That sequence tells you your own growing season for this plant, and it is the only way to know whether an early or late cut is helping or hurting in your particular climate.
Alongside the dates, record two measurements: the height you cut to and the finished height of the plant. Over three years the relationship between them becomes clear, and you will know whether cutting lower actually restrains the plant in your soil or whether the roots simply push it back to the same size regardless.
Add one line on the year's weather and one on any problem you saw. Bush clover has so few problems that when something does go wrong, the cause is nearly always in that weather line or in a change you made, and a page of dated notes finds it in minutes when a general troubleshooting list would not.