Hedge Trimming Done Right: Why Yours Is Bare at the Bottom

Nearly every struggling hedge in Calgary has the same shape problem, and it is easy to spot once you know it. The top is wider than the bottom, or the sides are perfectly vertical, and the base has gone thin, twiggy, and bare while the top is dense.

This is not a species problem or a soil problem. It is a geometry problem, created by the way the hedge has been cut, and it can usually be corrected with a few seasons of different cuts.

The Taper Rule

A hedge should be slightly wider at the base than at the top, tapering inward as it rises. The reason is light. The lower branches need direct sun to keep producing leaves, and a hedge with vertical or flared sides shades its own base for most of the day.

Shaded lower branches thin out, drop their leaves, and eventually die. That is the bare-legged hedge everyone recognizes. Cut with even a modest taper and the base gets light all season, stays clothed, and the whole hedge looks solid from the ground up.

When to Trim in Calgary

Formal hedges usually want two cuts a season here. The first comes after the spring flush has hardened off, roughly late June, and the second in late July or August to tidy the regrowth.

Avoid shearing after about mid-August. Late cuts push tender new growth that has no time to harden before frost, and that soft growth is what browns off over winter and leaves you with a scruffy hedge in spring.

Flowering Hedges Play by Different Rules

A caragana, lilac, or potentilla hedge grown for flowers follows the flowering rule, not the formal hedge schedule. Shrubs that bloom on old wood set their buds the previous summer, so shearing at the wrong time removes next year's flowers entirely.

If flowers matter, prune right after bloom. If you want a tight green wall and do not care about flowers, shear on the formal schedule and accept that you will get very few blooms. Trying to have both usually delivers neither.

Renovating a Hedge That Has Gone Bare

Deciduous hedges such as cotoneaster, caragana, and lilac tolerate hard renovation. Cutting the whole hedge back hard in late winter, while dormant, forces vigorous new shoots from the base and rebuilds a full hedge over two to three seasons.

Conifers are far less forgiving. Spruce and pine will not regenerate from bare old wood, so a cedar or spruce hedge that has been cut into brown wood stays brown. With conifers the rule is to trim lightly and often, always leaving green growth on every branch you cut.

Height, Sight Lines, and Neighbours

Before letting a hedge run tall, check what it is doing to sight lines at a driveway or corner, and remember that anything above eye level needs a ladder or a pole trimmer to maintain, twice a year, forever.

Branches that cross the property line are a common source of friction. The practical approach is a conversation with the neighbour before cutting, rather than a surprise gap in a shared hedge. It is also worth knowing what the City expects near boulevards and sidewalks.

Tools and the Case for Help

Sharp blades matter more than power. Dull hedge trimmers tear rather than cut, leaving shredded ends that brown off and look ragged from the street. A string line or a simple frame keeps a long hedge straight, because eyes drift.

For tall hedges, long runs, or a renovation you only get one shot at, it is worth bringing in a crew. Aardvark Tree Care trims and renovates hedges across Calgary and can tell you whether yours needs a reshape, a hard reset, or just a different cut next time.

Wider at the bottom than the top, always; a hedge with vertical sides shades its own base bare.