Why a Sunny Patio Suits Tomatoes So Well

There is something quietly satisfying about stepping out of the back door on a July morning, mug of tea in hand, and picking a handful of warm tomatoes straight from a pot. For cottage gardeners who lack a proper vegetable plot — or who simply want the crop close to the kitchen — a sunny patio is one of the best growing spaces on the property.

Tomatoes are Mediterranean plants at heart. They want warmth, light and shelter, and a south- or west-facing wall or fence provides all three, soaking up heat during the day and releasing it slowly overnight. Containers give you something a bed cannot: complete control over the compost, the drainage and the watering. You can move pots into shelter when a cold snap threatens, and you can raise them onto feet or a bench to keep them away from slugs and improve airflow.

Wind is the real enemy on an exposed rural site. A pot on a windy corner will sulk, twist and shed flowers, so choose a spot that catches the sun but sits out of the prevailing breeze.

Choose Compact Bush Varieties for Pots

The single most common mistake is planting a vigorous cordon variety in a small pot and wondering why it produces four tomatoes and a lot of leaf. Cordon, or indeterminate, types are bred to grow tall and crop over a long season; they need deep soil and firm staking. In a container, bush varieties are far happier.

• Bush (determinate) types stop growing at a set height, usually 45–75cm, and carry their crop on a neat, self-supporting framework. Ideal for pots and hanging baskets.
• ‘Tumbling Tom’ is the classic trailing cherry, excellent in a basket or on the edge of a raised pot, with red or yellow forms.
• ‘Maskotka’ and ‘Vilma’ are compact, heavy-cropping cherries that ripen well in a British summer.
• ‘Totem’ and ‘The Amateur’ suit larger pots and give decent-sized fruit on short stems.
• Cherry varieties generally out-perform beefsteaks in our climate — smaller fruit ripens faster and more reliably before the light fades in September.

If you do hanker after a cordon such as ‘Gardeners Delight’, grow it in the largest pot you can manage and be prepared to tie it in weekly and pinch out the sideshoots.

Pots, Compost and Planting Up

Size matters more than style. A bush tomato needs at least 10 litres of compost, and 15–20 litres is better; cordons want 25 litres or more. Terracotta looks lovely but dries out alarmingly fast, so if you use it, line the inside or be prepared to water twice daily in high summer. Glazed ceramic, plastic and fabric pots all hold moisture well.

Check for drainage holes — enlarge them if they are mean — and cover them with a few crocks or a piece of broken slate. Use a good peat-free multipurpose compost, ideally bulked out with a couple of handfuls of garden compost or well-rotted manure, plus a slow-release fertiliser if you prefer a gentler feeding regime.

Plant deeply, burying the stem up to the first pair of leaves; tomatoes will root along that buried stem and build a sturdier plant. One plant per pot is the rule — crowding causes competition, poor airflow and, inevitably, blight. Wait until the last frost has passed, usually late May or early June in most of the UK, and harden plants off over a week before leaving them out.

Water Consistently to Avoid Split Fruit

Irregular watering is the cause of most container tomato disappointments. Let a pot dry out to the point of wilting, then flood it, and the fruit will swell faster than the skin can stretch. The result is split, scarred tomatoes that spoil quickly.

• Water little and often, aiming to keep the compost evenly moist but never sodden.
• Once a day is usually enough in June and September; in a July heatwave, twice — morning and early evening.
• Water in the morning so foliage dries before night, reducing the risk of disease.
• Mulch the surface with grass clippings, straw or compost to slow evaporation.
• Stand pots on saucers or in a gravel tray so plants can draw up a little reserve on hot days.

Fluctuating moisture also encourages blossom end rot, those sunken black patches on the base of the fruit. Consistency, not quantity, is the cure.

Feed Weekly Once Flowers Appear

Until the first flowers open, the compost holds enough nutrients and feeding too early simply produces lush green growth at the expense of fruit. Once the first truss has set — small green marbles forming where the petals dropped — begin a weekly high-potash tomato feed, diluting it exactly as the label directs.

Continue every seven to ten days through the season. If leaves yellow between the veins, a dose of Epsom salts dissolved in water will usually correct the magnesium shortage. Never feed a dry plant: water first, then feed, or you risk scorching the roots.

Supporting Stems and Ripening the Crop

Even bush varieties benefit from a little help. Push a short cane — 90cm is ample — beside the main stem at planting time and tie it in with soft twine, loosening the ties as the stem thickens. A three-cane teepee or a simple wire cage works well for sprawling types and keeps fruit off the damp patio.

Cordon varieties need their sideshoots pinched out where leaf meets stem, and their growing tip removed in late August so the plant puts its energy into ripening what it already carries rather than starting new trusses that will never finish.

As autumn approaches, thin the foliage around the fruit to let in light, and drape fleece over pots on cold nights. Any tomatoes still green in October will ripen happily on a sunny windowsill, or in a paper bag with a ripe banana, which releases the ethylene that hastens colouring. There is no finer end to a cottage gardening year than a late-September bowl of home-grown tomatoes on the kitchen table, with the smell of the vine still on your hands.