Stand at local noon with the sun on your back; if your shadow points north and the garden lies ahead, the plot is south facing.
Aspect shapes seating, paths, and plant lists. A south facing garden gets the longest run of direct light. You can test it with a phone, a tiny sundial, or an online map. Pick one or try a few.
Telling If Your Garden Is South Facing: Fast Checks
Run these from a clear spot. Repeat if trees or walls shift the light.
| Method | How To Do It | South-Facing Result |
|---|---|---|
| Phone Compass | Open the app, hold the phone flat, and turn until the dial reads 180° (S). | Facing 180° looks toward the south; that boundary is the “sun side”. |
| Shadow At Solar Noon | Plant a straight stick and watch the shortest shadow. | The shadow points north; the opposite line is south. |
| Google Maps | Open satellite view; north is at the top. Trace the back door to the garden. | If the plot runs toward the bottom of the screen, that stretch is south. |
| Sun Path | Watch the arc from late morning to late afternoon. | In the northern hemisphere the bright belt sits to the south. |
| Warm Wall Clue | Touch sunny masonry late in the day. | The south wall often feels warmer and throws shade behind it. |
Phone Compass: One-Minute Setup
Calibrate if asked by moving the phone in a figure-eight. Stand near the centre of the garden. Turn slowly until you face 180°. That’s south. Look straight ahead: fences, hedges, or views in that line mark the hot edge. If the app offers true-north mode, switch it on for closer alignment with maps.
New to bearings? The Ordnance Survey has a short primer that pairs well with a quick garden check. Read the OS guide for a simple walkthrough.
Shadow Test: A Tiny Sundial
Push a straight stick into a sunny patch. Around local solar noon the stick’s shadow is shortest and aligns close to a north–south line. Stand with the sun behind you so the shadow runs away from your feet. That line points north; the direction behind your back is south. Mark it with pebbles and reuse it.
Google Maps: Check From Above
Open satellite view. North is at the top. Find your roof, then trace the back door to the grass or terrace. If the garden stretches toward the bottom of the screen, that’s the south side. If it stretches upward, that’s north. This view helps on cloudy days or where tall blocks cast complex shade.
What “South Facing” Means For Heat And Growth
Aspect shifts light, warmth, and dryness across a site. In short, south and west feel warmer and brighter; north and east run cooler and shadier. The Royal Horticultural Society explains how aspect, slopes, and walls create small pockets of warmth or chill that change what thrives. See the RHS note on garden microclimates: RHS microclimates.
A south facing border beside a wall often works like a heat trap. Masonry reflects and stores warmth, lifting soil temperatures. That suits grapes, figs, peaches, many herbs, and drought-tolerant perennials. It can also dry the ground fast, so water and mulch through hot spells.
Plants That Like Full Sun
Once you confirm the aspect, match the light. Sun lovers include lavender, rosemary, thyme, sages, sedums, echinacea, salvias, yarrows, and many ornamental grasses. Fruit fans can try vines, apricots, nectarines, and cherries on sheltered south walls. For bedding, pick cultivars marked for “full sun”. Turn pots through the season if one corner steals the light.
Magnetic South Vs True South
Compasses point to magnetic north, not the geographic pole. The offset, called declination, varies by location and shifts through the years. For quick garden checks that small offset rarely changes the call, but it explains why your phone and a map line may not match exactly.
Clock noon and solar noon are not always the same; due to longitude and the equation of time, the sun may cross your local meridian a bit before or after 12:00. That’s why the shortest shadow can land a little earlier or later than lunchtime. If you miss it, watch the stick’s shadow shrink and grow; the moment when it is shortest gives you the cleanest north–south reliable reference line. Mark that line once, clearly, and you can return to it in any season, even on hazy days when the compass app feels unsure.
- Stand away from cars, steel rails, or large speakers that can pull the needle off course.
- Hold the phone flat and steady; keep magnet straps and some cases away from the sensors.
- If your app allows, switch to “true north” so bearings match maps better.
Season By Season: How The South Side Behaves
In summer the midday sun rides high, so shadows are short. A south facing terrace glows through the day and ripens fruit well. In winter the sun runs low and stays to the south for a shorter span, so borders near tall fences may sit in shade while open beds still catch light. Compare the same spot in June and December to see the swing.
Light Patterns By Orientation
Use this table to compare patterns and plan seats, paths, and planting.
| Orientation | Typical Daily Sun | Good Uses & Plant Ideas |
|---|---|---|
| South Facing | Sun from late morning to late afternoon; warmest borders on the south edge. | Heat-loving herbs, fruit against walls, long-bloom perennials, dining terraces. |
| West Facing | Gentle mornings; strong light from mid-afternoon to evening. | Evening seating, roses, dahlias, sun-tolerant shrubs. |
| East Facing | Bright mornings; shade grows after lunch. | Breakfast patio, spring bulbs, many ferns and hostas in deeper spots. |
| North Facing | Least direct sun; cool and slow to dry out. | Woodland plants, lush foliage displays, storage corners or shed runs. |
Troubleshooting Odd Sites
High Hedges Or Buildings
Fixed shade can fool quick checks. Repeat the compass and shadow tests from the most open area you own. If a neighbour’s tree blocks midday light, note where the sun re-appears; the broad arc still reveals the south side even when edges are shaded.
Slopes And Steps
A south facing slope receives more sun and sheds cold air downslope at night. Beds on terraces can warm at different rates. Plant thirstier crops on lower ledges, and fans of heat on upper ones. Water and mulch the hot runs more often than level ground.
Courtyards And Walled Plots
Courts act like ovens on the south edge and cool cupboards on the north edge. Place seats on the milder side, and train fruit on the hot walls where roots can reach moist soil. Use tall pots or trellis to cast planned shade over paving.
Balconies And Roof Terraces
Check the outer wall with a phone compass. Many balconies face the same way as the main room. A south facing balcony feels bright through the day; pick deeper pots, water-retaining compost, and keep a can nearby. Add a screen for windy corners.
Compass App Feels Jumpy
Metal railings, BBQs, cars, and speakers can skew readings. Step a few paces away and try again. If the dial still swings, use the Google Maps and shadow methods to confirm your call.
Design Moves After You Confirm South
Place main seats where the afternoon breeze moves, then cast light shade with a small tree, a sail, or a pergola. Put sun lovers on the hot edge, then grade to mid-shade picks as you move north. In wide beds, set tall plants to the north so they don’t shade lower growers. Pale gravel bounces light; dark mulch warms soil in spring. Water bowls cool patios by evaporation. Break up bright runs with groundcovers if glare often tires the eyes.
Quick Checklist
- Open the phone compass, face 180° (S), and note what part of the garden lies ahead.
- Run a stick shadow at solar noon to draw a north–south line.
- Scan your home on Google Maps; north is at the top, south at the bottom.
- Watch where light lingers from late morning to late afternoon.
- Match plants and seating to the sunny belt, then add shade where you relax.