What an outdoor review can and cannot decide
Outdoors the constraints arrive in a different order. Indoors you usually rearrange objects inside a fixed shell; outside you are dealing with things that grow, move water, and load the ground. Roots lift paving, a canopy that fits this year will not fit in ten, and a low corner that holds water after one rain will hold it every rainy season afterwards. A traditional reading can tell you where a screen, a shelter, or a water body has usually been placed and why that placement felt settled. It cannot tell you whether a particular tree survives your winters or whether your soil drains. So the reading is the question and the site survey is the answer: the reading points at a place, and measurement decides what, if anything, goes there.
Start with the strip that touches the wall
Begin with the first metre and a half of ground next to the building, because that strip decides more than the rest of the plot. Paving should fall away from the wall, never toward it; a fall of one to two percent across the width of the strip moves surface water without looking sloped. Check where the downpipes discharge, whether the damp course sits above soil level, and whether anything planted there will push roots into the footing or the drainage run. The classical preference for a sheltered back and an open front describes the same strip from the other side: planting on the windward side cuts winter heat loss, and an uncluttered front keeps light and access. Read the old rule as a wind-and-drainage instruction and it stops being decorative.
Trees are a distance problem before a symbolism problem
Every tree question resolves into three measurements: mature canopy spread, mature root spread, and the length of the shadow the tree casts at midday in the season you care about. A tree whose canopy will eventually touch the wall is already too close on the day it is planted, because the bill arrives ten years later as blocked light, lifted paving, and a gutter full of leaves. As a working rule, keep the trunk at least half the mature canopy spread away from the wall, never less than three metres for a species that will exceed eight metres in height, and further still for shallow-rooted species or anything sitting over a drain. Only then choose the side: a deciduous tree on the sunny face gives shade in summer and lets light through in winter, while an evergreen in the same place gives permanent shade. Tradition hands a species a fortune; the site hands it a job. Where the two disagree, the job is the half you can check.
Water is a maintenance problem before a direction problem
A water feature is a pump, a basin, a power supply, and a weekly task. Before direction, settle four numbers: how many litres the basin holds, how often the pump turns that volume over, how loud it is at one metre, and how many minutes a week the filter and the surface need. Standing water above roughly twenty degrees breeds mosquitoes in seven to ten days, so a feature switched off for a fortnight in summer is a nursery. The overflow path matters more than the outline: if the basin overflows toward the house, the water ends up back in the strip you just spent effort draining. The traditional caution about water running at the entrance is usually read as a fortune warning; physically it is a splash, erosion, and slip warning, and it holds up for those reasons.
Paths and gates decide the sight line
A gate does two jobs: it passes the widest thing that ever needs to go through, and it frames what a visitor sees first. Measure the widest object — a wheelbarrow, a pram, a bin, a bike — and make the clear opening wider than that with the gate standing open. Then check the swing: a gate that opens inward across the path turns the first metre into a trap. Finally stand at the gate and look. Whatever you see first is what the garden is about; if the first thing is a bin store or a blank wall, the path is doing no work. A path running straight from gate to front door is the arrangement tradition comments on most often, and the physical version of that comment is that a straight run carries wind, water, and a direct view in a single line. Offsetting the run or interrupting it with planting costs a metre and answers all three.
Keep a record you can compare across seasons
Garden changes are slow, which makes them easy to misjudge. Fix four camera positions — the gate, the back door, the sunny corner, and the corner that stays wet — and photograph each one at the same hour in every season. Add a drainage note after the first heavy rain: where water stood, and for how long. Then change one thing per season and compare the same four frames.
- Mark the four camera positions with a stake or a paving stone so the frame repeats.
- Write the date and the hour on every photograph; changing light is the variable that fools you.
- After heavy rain, walk the plot and mark standing water with a stick while it is still there.
- Change one thing per season — one tree, one path, one drain — never three at once.
- Keep the receipts and the plant labels; the record is what makes the next decision cheap.