Mapping sun and shade in a Calgary yard

The bright patch seen from a Calgary kitchen at lunchtime may be in shade by the time someone uses the garden after work. Another corner might receive morning light through a tree canopy but little direct light later. A simple light map gives these differences a place in the lawn conversation. It is especially useful before treating an entire small yard as one growing environment.

Start with the shape of the garden

Draw the house, garage, fence, trees, deck and proposed lawn. Mark north using a reliable map or compass, then name a few locations with landmarks that will remain: back step, lilac edge, garage corner. Avoid beginning with labels such as “good grass area” or “bad grass area.” Those are decisions to make after the observations, not facts to put on the first drawing.

The City's YardSmart planning guidance includes mapping sun and shade. Your own sketch can be modest: a sheet of paper with the boundaries and enough space to add dates. A measured survey is a different document and is not replaced by this exercise.

Record light at more than one moment

Visit the same points in the morning, around midday and later in the day when practical. Record the actual time and whether clouds interrupted the view. Use separate marks for direct sunlight, filtered light and full building shade. If you miss a period, leave it unknown. Three brief visits can establish a useful comparison, but they do not prove a precise daily total of sunlight.

Photograph from a path or deck so newly prepared ground stays undisturbed. Include part of the fence or house for orientation. When a tree has leaves, note that fact; a photograph taken before leaf-out does not represent the same canopy conditions. Keep the season visible on the page rather than presenting one spring visit as a permanent map.

Overlay how people use the space

Add the everyday route to the garage, the place where a dog waits at the door and the patch where children usually play. A shaded corner that is also a busy shortcut raises a different design question from an equally shaded quiet border. The light record becomes more useful when it describes both the growing conditions and the job the surface is expected to do.

Use the map to ask a better planting question

Bring the sketch to a supplier or landscape professional and ask what lawn or other planting is appropriate for each intended use. The City's lawn alternatives resource considers site conditions and traffic. It provides options to investigate, rather than a promise that every listed plant belongs in every Calgary yard.

Do not choose solely from a seed bag's broad “shade” description. Ask about the actual product, its intended light conditions and its care instructions. If the difficult corner is also a drainage route or a tree-protection area, resolve those constraints before changing levels or installing a border. A smaller, better-defined lawn can be a more workable plan than extending turf into every remaining gap.

Compare two possible boundaries

Imagine a yard with a sunny central rectangle and a narrow shaded strip behind a garage. One option carries lawn through the strip; another retains the central lawn and gives the strip a different treatment after professional review. Draw both options. Compare access for care, watering coverage, tree roots, pedestrian needs and the amount of fragile edge each creates. The exercise does not choose the answer automatically. It makes the tradeoffs visible.

Keep measurements separate from observations. An approximate shaded strip on a sketch is enough to begin a design discussion; quantities for ordering still need an actual area takeoff. Record which drawing was eventually selected so a future care helper knows which boundary is intentional.

Keep observation separate from expectation

Write “direct light at 4 p.m. on this visit” rather than “always sunny.” If you have only seen the garden on a weekend, say so. A neighbour's description can add useful history, but label it as a reported observation. This small distinction prevents a confident-looking plan from overstating what anyone actually checked. When a planting recommendation arrives, keep it beside the dated map so its assumptions remain visible to the next person caring for the garden.

Return when the surroundings change

• Date a new observation after a fence, shed or deck is added.
• Compare leafy and leafless canopy conditions without treating them as identical.
• Record whether the same point is being photographed each time.
• Leave unobserved periods blank instead of filling them from memory.
• Show the final lawn boundary and the reasons for its exceptions.

Extend the light map with a north-facing yard notebook for a shaded setting, and tree-root boundary notes where retained trees share the space. Together these records help a garden evolve around the conditions it actually has.