Gadenin日本語Get the appThe shape of the osmanthus year
Everything in the calendar hangs off one hinge. The plant flowers, then makes new growth, then sets buds on that growth, then holds them until it flowers again. Any cutting you do between bud set and flowering removes the display. So the only substantial pruning window is the short period immediately after the flowers fade, and the rest of the year is watering, mulching, watching and waiting.
That makes the schedule genuinely simple compared with most garden shrubs. There is one feed, one mulch, one prune, one round of winter protection for young plants, and a couple of inspections. Nothing needs doing weekly. What the plant rewards is doing those few things at the right moment rather than doing many things often.
Adjust the seasons to your own climate rather than to any fixed date. Different forms of osmanthus flower at different times of year, some in spring and some in autumn, so watch your own plant and let its flowering mark the start of the pruning window. Everything else follows from there.
| Season | Main job | Watch for | Do not do |
|---|---|---|---|
| Early spring | Feed and mulch, tidy winter damage | Wind-scorched leaves, dead twigs | Do not shear a plant that flowers in spring |
| Late spring | Prune, if it flowered in spring | Ants and sticky leaves | Do not let new plants go dry |
| Early summer | Water young plants, thin the interior | Scale crawlers on shaded stems | Do not feed with high nitrogen |
| Late summer | Take semi-ripe cuttings | Drought stress, dull folded leaves | Do not shear; buds are already set |
| Early autumn | Enjoy flowering, plant new shrubs | Where the scent does and does not reach | Do not cut before flowering finishes |
| Late autumn | Prune, if it flowered in autumn; soak before freeze | Exposed young plants | Do not leave pots dry going into winter |
| Winter | Windbreaks up, otherwise leave alone | Browning on the windward side | Do not cut damaged foliage off yet |
Spring: feed, mulch and repair
As growth resumes, deal with whatever winter did. Pick off or shorten badly scorched leaves and shoots back to healthy wood, now rather than earlier, so the plant is not stimulated into growth during the cold. Remove dead twigs from the interior at the same time and pull out any accumulated leaf litter from beneath the shrub.
Then feed once. A balanced general fertilizer scattered over the root area and watered in is all an established plant gets for the year. Follow it with two inches (5 cm) of garden compost or composted bark spread over the root zone and held an inch clear of the stem. That mulch is doing most of the work of the year: holding moisture through summer, moderating soil temperature, and slowly improving the soil.
If the plant flowers in spring, its pruning window opens as soon as the last flowers brown. Take the shape you want then, no more than a quarter of the plant in a routine year, cutting to joints rather than leaving stubs. Water well afterwards to support the flush of new growth that follows.
Summer: water, watch, and take cuttings
Established plants need water only in genuine drought. Plants under three years old need a deep soak every seven to ten days whenever the top three inches (8 cm) of soil are dry, and containers need checking far more often, sometimes daily in heat. Water heavily and infrequently at the base rather than lightly and often over the leaves; shallow watering encourages surface roots that suffer more in the next dry spell.
This is also the season to look inside the plant. Scale insects build up in still, shaded, congested growth, so thin out crossing and inward branches to move air through the middle, and check the undersides of leaves and the shaded stems for brown limpet-like bumps, sticky foliage and ant activity. Catching it now is far easier than dealing with a heavy infestation and sooty mold later.
Late summer is the moment for semi-ripe cuttings, when this year's shoots bend with resistance rather than snapping or flopping. It is emphatically not the moment to shear the plant into shape, however untidy it looks. The buds are already on those shoots, and cutting now trades the entire coming display for a few weeks of neatness.
Autumn and winter: flowering, planting, protection
For autumn-flowering plants this is the payoff, and it is worth using it as an assessment. Walk the garden on a still evening and note where you can smell the plant and where you cannot. That tells you more about whether it is well sited than any amount of looking at it, and it informs where you put the next one.
Autumn is a good planting season in mild climates, giving roots months of cool damp soil before summer. In hard-winter regions, wait for spring instead. Either way, water new plants in thoroughly and mulch them. Before the ground freezes, give everything a final deep soak, including containers, because a plant entering winter with moisture around its roots weathers cold dry wind far better than a dry one.
Put windbreaks up for young or newly planted shrubs in exposed gardens: netting or hessian on stakes, standing six inches (15 cm) clear of the foliage, on the windward side. Then leave the plant alone. Do not prune, do not feed, and do not cut off browned leaves in midwinter, however bad they look; that damaged foliage is still protecting the wood behind it, and the plant almost always looks whole again by midsummer.
Keep a short annual record: the date flowering started and ended, the date you pruned, the date winter damage first appeared, and how heavily it flowered. Three years of those four lines will tell you more about your particular plant in your particular garden than any general guide can.