Gadenin日本語Get the appWhere the buds actually are
The sequence matters more than anything else in this guide. Shoots extend during the first half of the growing season. Through the warm months those shoots harden and ripen, changing from soft green to firm mature wood. Flower buds then form in the leaf joints of that ripened current-season growth, and they open later in the year in a short intense burst of scent. The buds are tiny and tucked into the leaf axils, so by the time they exist you cannot see them from a few feet away.
Two things follow from this. First, the shoots you can see extending in spring are next autumn's flowers, so anything that damages or removes them costs you the display. Second, and this is the one that catches people out, the plant looks completely ordinary in the weeks before it blooms. There is no swelling truss to warn you off, so a tidy-minded gardener runs the shears over a shrub that is fully loaded with invisible buds and removes the entire season's scent in ten minutes.
The causes, ranked by how often they are the answer
Work through these in order rather than reaching for a fertilizer. A healthy, vigorous plant that makes plenty of leaf and no flowers is almost never short of nutrients; it is being cut at the wrong time or grown in too little light. A plant that is weak as well as flowerless has a root problem, and no amount of feeding fixes wet roots.
| Cause | How to recognize it | What to do |
|---|---|---|
| Sheared in the second half of the growing season | Vigorous, dense, tidy, uniformly flowerless | Move all cutting to straight after flowering |
| Too little light | Open habit, bare lower stems, few flowers on the sunny side only | Thin overhanging branches or accept it as a screen |
| Late nitrogen feeding | Very lush soft leaf, shoots still green late in the season | No nitrogen after midsummer |
| Too young or newly moved | Small plant, healthy, putting energy into roots | Wait. Two to four years after planting is normal |
| Drought while buds were forming | Buds visible then shriveled and dropped | Deep watering through late summer dry spells |
| Wet roots | Dull leaves, interior leaf drop, no vigor | Improve drainage or replant on a raised mound |
| Cold wind at bud stage | Browned buds and scorched leaf edges together | Windbreak on the exposed face |
| Heavy scale infestation | Sticky leaves, black sooty coating, weak growth | Treat the scale, flowering returns as vigor does |
Growing conditions that produce a heavy bloom
Light is the input you can least substitute for. Six hours or more of direct sun gives you buds along the whole length of each ripened shoot. Below about four hours the plant redirects into leaf and extension growth, and flowering thins out to a token scatter near the top. If a nearby tree has quietly closed over the shrub in the last few years, that is very often the entire explanation for a plant that used to flower and now does not.
Ripe wood is the second input. The plant needs a warm settled second half of the season with steady moisture and no nitrogen so that this year's shoots firm up properly. A shrub that is still pushing soft green tips late in the season has not ripened, and unripened wood does not set buds. This is why heavy late feeding, hard late pruning and a cool sunless summer all produce the same disappointing result by different routes.
Steady moisture is the third. Buds form during the driest part of many gardeners' year, and drought at that moment aborts them after they have formed. If you look closely in late summer and see tiny clusters in the leaf joints, that is the point at which a deep soaking during a dry spell directly buys you scent.
During and after the bloom
The flowering period is short, often only a couple of weeks, and it is strongly affected by weather. Cool still conditions hold the scent close to the ground and make it carry; heavy rain or hot wind strips the small flowers quickly. In a good year a mature plant may produce a second lighter flush a few weeks after the first, which is normal and needs nothing from you.
There is no deadheading to do. The flowers are small and fall cleanly, leaving a scatter of creamy petals on the ground under the shrub that is part of the pleasure of the plant rather than a mess to clear. Once the display is finished, the pruning window opens, and that is the moment to do any shaping you have been putting off all year.
Each year, record the week the first flowers opened, how long the scent lasted, how much sun the plant now gets, and the date of your last cut. Three seasons of that data settles arguments about the shrub in a way that guesswork never will, and it usually shows a direct line between the pruning date and the strength of the bloom.