Every border has its greedy feeders and its modest nibblers. Give them all the same diet and you’ll either starve the hungry or overface the shy. The trick is to match your feeding to what each plant is doing and when it’s doing it. Get that right and you’ll see stronger stems, richer leaf colour and far more flowers — without the soft, floppy growth that comes from being too generous.

Understanding Plant Appetites

Plants are not all created equal when it comes to food. A leafy shrub like a hydrangea or a vigorous climber such as a clematis will thank you for a steady supply of nitrogen in spring. A flowering perennial, on the other hand, needs less nitrogen and more potash once it starts to bud. Roses are famously hungry and benefit from a dedicated rose feed. Acid-lovers like rhododendrons and camellias need ericaceous conditions, which means ordinary general fertiliser can do more harm than good. Then there are the thugs — plants like mint or Japanese anemones — that will grow lush and leafy on almost nothing, and the delicate alpines that resent rich soil entirely. The first step is to know which group you are dealing with.

When to Feed Borders

Timing matters as much as the product. In early spring, as growth begins, a balanced general fertiliser gives perennials and shrubs the energy to push out new leaves. Apply it to moist soil, lightly forked in, just as you see the first signs of life. By early summer, switch your attention to flowering plants. Tomato feed — high in potash — is perfect for encouraging buds, fruit and robust blooms. Stop feeding woody plants and trees by late summer; soft growth made late in the season will not harden off before winter and can be damaged by frost. Autumn is not a time for general fertiliser; it is a time for mulch. And never feed a plant that is drought-stressed, waterlogged or dormant — you will only cause root damage.

• Early spring: general fertiliser for leafy growth.
• Late spring to early summer: tomato feed for flowers and fruit.
• Midsummer: only feed if plants look pale or hungry.
• Autumn: mulch, not fertiliser.
• Winter: leave well alone.

Choosing the Right Feed

For most borders, a balanced general fertiliser is your workhorse. Look for one with roughly equal proportions of nitrogen, phosphorus and potassium — often labelled NPK. Fish, blood and bone is a traditional slow-release choice that suits leafy shrubs and vegetables. For flowers and fruiting crops, a liquid tomato feed is invaluable; apply it every fortnight from the moment buds appear until they fade. If you garden on chalky soil, you may need to use sequestered iron to correct yellowing leaves on acid-lovers. Seaweed extract is a gentle tonic that helps plants shrug off stress, but it is not a substitute for proper feeding. And remember: granular feeds are best scattered and watered in, while liquid feeds are taken up almost immediately.

• General fertiliser: spring tonic for most shrubs and perennials.
• Tomato feed: high-potash boost for flowers, tomatoes and roses.
• Fish, blood and bone: slow-release for leafy growth and soil health.
• Ericaceous feed: essential for rhododendrons, camellias and blueberries.

The Role of Mulch

Mulch is not a fertiliser, but it is the closest thing to a magic wand in the border. A 5–7cm layer of well-rotted manure, garden compost or leaf mould does three jobs at once: it suppresses weeds, conserves moisture and, as it breaks down, feeds the soil life that in turn feeds your plants. Apply it in early spring while the soil is still damp, or in autumn after the first frosts. Keep it clear of stems and crowns to avoid rot. Unlike a bag of fertiliser, mulch releases nutrients slowly and steadily, which means no flush of weak growth — just steady, resilient plants that cope better with dry spells.

Avoiding Overfeeding

More is rarely better. Overfed plants produce soft, sappy stems that attract aphids and snap in the wind. You may get lots of dark green leaves and very few flowers. In severe cases, excess fertiliser burns roots and leaves a white crust on the soil surface. Always follow the dose on the packet, and halve it for newly planted or delicate subjects. Water the soil before and after feeding to avoid root scorch. If a plant looks happy, leave it alone — yellowing leaves are not always a sign of hunger; they can mean waterlogging, drought or disease. Feed the soil with mulch, feed the plant only when it asks.

A Seasonal Feeding Plan

Stick to this simple rhythm and your borders will reward you. In early spring, scatter a balanced general fertiliser around perennials and shrubs, then mulch. In late spring, start liquid tomato feed for roses, clematis and any flowering container plants. Through midsummer, continue tomato feed every two weeks, but skip it if plants are lush and healthy. In early autumn, top up mulch and stop all high-nitrogen feeding. In winter, do nothing but plan next year’s planting. Feed the soil, not just the plant, and you will grow stronger, healthier borders with far less fuss.