Gadenin日本語Get the appLate winter into early spring
This is the main working window. The plant is still dormant or barely moving, the structure is visible, and any cut you make has the whole growing season ahead to be grown over. Start by removing dead, broken and crossing branches back to the trunk or to a live fork; this costs nothing in live growth and often transforms how a plant looks.
Do the year's main shearing of hedges and formal shapes now, cutting to a line, keeping the taper, and checking the depth of green behind the cut face as you work. This is also when you thin congested dwarf globes and pull dead material out of their centers, and when you shorten spreading forms back to live side shoots inside the green.
Remove winter ties from columnar forms once the risk of heavy snow has passed, and check any stakes and ties on young plants for tightness. Top up mulch to two or three inches (5-8 cm) across the root area, keeping it clear of the trunk. If a container-grown or genuinely starved plant needs feeding, this is the moment for a single slow-release application.
Spring and early summer
New growth flushes and the plant is at its most obviously alive. Plant new conifers once the soil has warmed but before summer heat, watering each one in heavily and mulching. Watch the flush for pale, soft, distorted growth, which points to aphids, and for early scale crawlers, which are the one stage of that pest worth treating.
Once the first flush has hardened, usually a few weeks after it emerged, give formal shapes and hedges a light second shear to crisp them up. Keep it light. The purpose is tidying, not reduction, and the same rule about staying in the green applies with no exceptions.
Begin checking soil moisture weekly on everything planted within the last three years, on containers, and on anything against a wall. Water by soaking when the soil is dry four to six inches (10-15 cm) down, not on a fixed schedule.
High summer
The working rule for high summer is to stop cutting and start watching. Heat and drought are the season's real risks, along with spider mites, which build fastest in hot still dry conditions. Check susceptible plants weekly by tapping a shoot over white paper, and hose the foliage forcefully at the first sign rather than waiting for visible browning.
Water deeply and infrequently. One long soak that wets the full root depth beats daily sprinkling, which encourages shallow rooting and evaporates before it does any good. Check the soil rather than the foliage, because conifer foliage does not wilt to warn you; by the time it browns, the damage is permanent.
Do not shear now in hot dry weather, and do not feed. Both push the plant in the wrong direction at the wrong time. Hand-pick any bagworm-type cases you find hanging from the shoots, because removing them now prevents a much larger population next year.
Late summer and early autumn are the worst time of the entire year to shear a conifer. Cutting then triggers a soft late flush that cannot harden before cold weather and browns off over winter, so the tidy shape you cut in one season becomes a scorched one in the next.
Autumn into early winter
Early autumn is the best planting window in mild climates: the soil is still warm, the air is cooling, and the plant has months of moist conditions to root out before the next dry spell. Plant, water in heavily, mulch, and stake low anything tall on an exposed site.
Expect interior foliage to turn fawn and drop now on most forms. This is normal shedding of shaded old growth, not disease. Brush or shake the dead material out of dense globes and hedges so it does not sit inside the plant holding moisture, and clear it away from the base.
Before the first hard frosts, put up wind screens on the exposed side of anything planted within the last two years, and tie columnar and multi-stemmed forms loosely with a soft wide band spiralled up the outside if heavy wet snow is likely. Give evergreens a last deep watering while the soil is still workable, since a plant that goes into winter dry is the one most likely to scorch.
| Season | Prune | Plant | Water | Watch for |
|---|---|---|---|---|
| Late winter to early spring | Main shear; remove dead wood; thin dense forms | Possible once soil is workable | Rarely needed | Loose stakes, tight ties, snow damage |
| Spring to early summer | Light shear after the first flush hardens | Best spring window once soil has warmed | Weekly checks on new and container plants | Aphids on soft growth, scale crawlers |
| High summer | None | Avoid | Deep soak in drought, check at 4-6 in (10-15 cm) | Spider mites, drought stress, bagworm cases |
| Autumn | None; clear dead interior foliage only | Best window in mild climates | One last deep soak before freeze | Normal inner browning versus abnormal patterns |
| Winter | None until dormancy is well established | No | Containers only, on mild days | Wind scorch, snow load, splayed columnar forms |
What to write down each year
Conifers reward record keeping more than fast-growing plants do, because everything they do happens slowly enough to forget. Four things are worth recording every year, and they take a few minutes each season. Measure the new growth: pick one representative shoot per plant and record how many inches it extended. That number tells you whether the plant is thriving, and a sudden drop is the earliest warning of a root problem you will get.
Record what you cut and when, by season rather than by date, along with how deep the green shell was behind each hedge face. A hedge that had eight inches (20 cm) of green three years ago and four inches (10 cm) now is drifting toward the limit, and knowing that lets you stop shearing that face before you cut into bare wood you can never fix.
Record damage and its position: which side, old or new foliage, and the weather that preceded it. Also record anything that changed near the roots, digging, paving, a new downspout, a raised bed, because conifers respond a year or more after the cause and nobody remembers it otherwise. Finally, photograph each plant from a fixed spot once a season so slow changes become visible.
Carry the previous year's notes with you when you start work at the end of winter. The list of what to do this year mostly writes itself out of what you observed last year: which face not to cut, which side needs a screen, which plant to hose before the mites arrive, and which one to dig around and check.