Understanding Sun, Shade and Aspect

One of the questions I ask almost every new client is a surprisingly simple one.

"How much sun does this border get?"

The answer is often immediate.

"It's a sunny border."

Or perhaps,

"It's mostly shade."

The interesting thing is that, after spending a little time in the garden, those descriptions often turn out to be only partly true. Very few gardens fit neatly into the categories we tend to use. Most contain a fascinating mixture of light and shade that changes not only through the course of a day, but throughout the year as well. Understanding those changes is one of the biggest steps towards creating planting that genuinely thrives.

The Garden Is Constantly Changing

It's easy to think of sunlight as something fixed, yet gardens are remarkably dynamic places. Morning sunshine arrives from one direction, afternoon sunshine from another, and mature trees cast completely different shadows in July than they do during winter when the leaves have fallen. A border that feels wonderfully bright in April may become noticeably darker once nearby trees come into full leaf.

That's one of the reasons I rarely make planting decisions based on a quick glance. I prefer to understand how the garden behaves over time. The more familiar you become with the patterns of light across your garden, the easier it becomes to place plants where they'll naturally flourish.

What Do We Mean by Aspect?

Aspect simply describes the direction your garden, or a particular part of it, faces. A south-facing border generally receives the greatest amount of sunshine during the day, while north-facing areas often remain cooler and shadier. East-facing borders enjoy gentle morning sun before becoming cooler in the afternoon, whereas west-facing borders tend to receive warmer afternoon and evening sunshine.

It's a useful guide, but it isn't the whole story. Trees, buildings, fences and neighbouring properties all influence the amount of light a border actually receives. Two south-facing gardens can behave very differently if one is overlooked by mature trees while the other is completely open to the sky.

Not All Shade Is the Same

Shade is one of the most misunderstood conditions in gardening. Many people simply describe a border as "shady," but there are several different kinds of shade, each creating its own growing environment.

Dappled shade beneath deciduous trees allows sunlight to filter through the canopy, creating ideal conditions for many woodland plants. Dry shade beneath large trees can be far more challenging because the roots compete for both water and nutrients. Deep shade beside walls or evergreen hedges often receives very little direct sunlight at all, requiring a different selection of plants again.

Recognising these differences opens up far more possibilities than simply dismissing an area as "too shady."

Sunshine Brings Opportunities Too

Sunny borders have their own challenges. While abundant light encourages flowering and strong growth, it also increases evaporation. During prolonged periods of warm weather, exposed borders can become surprisingly dry, particularly if the soil is free draining. Plants that naturally grow in Mediterranean climates often cope well with these conditions, while moisture-loving species may quickly become stressed.

As our summers become warmer and periods of drought become more frequent, choosing plants that are naturally suited to sunny, dry conditions is becoming increasingly important. Rather than constantly trying to compensate with watering, we can often achieve better results by selecting plants that enjoy those conditions from the outset.

Observe Before You Plant

One of the simplest pieces of advice I can offer is not to rush. Before planting a new border, spend a few days observing it. Notice where the first sunlight appears each morning and where the shadows fall during the afternoon. Watch how those patterns change as the seasons progress. Even a few minutes spent looking at the garden at different times of day can reveal details that would otherwise be easy to miss.

These observations are worth far more than simply relying on the direction shown by a compass. They tell you how your particular garden behaves rather than how it's expected to behave.

Let the Garden Guide You

I sometimes think gardeners put themselves under unnecessary pressure to grow plants they've admired elsewhere. We see lavender flowering beautifully in a friend's garden and wonder why ours struggles. We buy a collection of woodland ferns because they looked wonderful in a magazine, only to discover that our borders spend most of the afternoon in full sunshine.

The truth is that every garden has its strengths. Some naturally lend themselves to colourful Mediterranean planting. Others are perfect for woodland gardens filled with ferns, hellebores and hostas. Rather than fighting against those conditions, I've always found it more rewarding to celebrate them.

Every Garden Has Its Own Character

One of the pleasures of working in gardens across Gloucestershire is seeing how different they all are. Gardens only a few miles apart can feel completely different because of their aspect, surrounding trees, local topography and soil. Those differences aren't obstacles to overcome. They're what give each garden its own personality.

When we stop thinking in terms of "good" or "bad" conditions and instead start recognising opportunities, gardening becomes much more enjoyable. There is no such thing as a perfect aspect. There are simply different conditions waiting for the right plants.

From Marcus

One of the biggest lessons gardening has taught me is that every garden has its own rhythm. Some wake up with the morning sun, others remain cool and sheltered until the afternoon. I've learnt not to judge a border too quickly because what looks like deep shade in July may be surprisingly bright during spring. Spending time simply watching the light move across a garden has saved me from making countless planting mistakes over the years, and I still do it today whenever I visit a new client.

Looking for Help?

If you're unsure which plants will suit the light conditions in your garden, or you're planning a new border and would like some professional advice, I'd be delighted to help. Marcus Bergin Gardening provides planting advice, border renovation and ongoing garden maintenance throughout Cheltenham, Bishops Cleeve and the surrounding Gloucestershire villages.

Related Guides

• The Complete Guide to Planting & Borders

• Why Plants Fail in Gardens

• Understanding Your Garden Before You Plant

• Right Plant, Right Place

• Best Plants for Clay Soil

• Best Plants for Shade

• Best Plants for Sunny Borders

• Low Maintenance Planting Ideas

• Renovating a Tired Border