Tips for Growing Tomatoes
Sun-ripened tomatoes deliver delicious taste in every bite. Just a few healthy plants will produce buckets of fruit.
Tomatoes run on warmth; plant in late spring and early summer except in Zone 10, where they are a fall and winter crop.
Choosing tomato varieties can be confusing because there are so many, but it’s a good idea to plant some of each for variety and length of season. Varieties resistant to diseases are always a good choice because, of all veggies, tomatoes tend to get the most diseases.
Soil, planting and care
Devote a prime, sunny spot to tomatoes, which will grow into a tall screen of green foliage studded with ripening fruits in mid to late summer.
Tomatoes need at least 8 hours of sun to bring out their best flavours, and you will need to stake, trellis, or cage the sprawling plants to keep them off the ground. Decide on a support plan before you set out your plants.
• Try to space robust, long-vined, indeterminate varieties about 90cm (3') apart.
• Stocky determinate tomato plants can be grown at tighter 60cm (2') spacing.
• A single patio tomato plant will nicely fill a 45cm (18") wide container.
You can combine fast-maturing varieties with special season-stretching techniques to grow an early crop, but wait until the last frost has passed to transplant main-season tomatoes. Tomatoes take up nutrients best when the soil pH ranges from 6.2 to 6.8, and they need a constant supply of major and minor plant nutrients.
To provide the major nutrients, mix a balanced timed-release or organic fertilizer into the soil as you prepare planting holes, following the rates given on the fertilizer label. At the same time, mix in 7-10cm (3-4") of compost. The compost will provide minor nutrients and help hold moisture and fertilizer in the soil until it is needed by the plants.
To grow really strong tomato plants, we recommend deep planting, so that two-thirds of the plant’s stem is buried. Yes, this is against everything you’ve probably been told!
You can plant tomatoes deeply. If you plant deeply, they will sprout roots along the buried stem, so your plant will be stronger and better able to find water in drought.
Cover the ground with 5-10cm (2-4") of mulch to keep down weeds and keep the soil evenly moist. Straw and shredded leaves make great mulches for tomatoes.
If summer droughts are common in your area, use soaker hoses or other drought-busting techniques to help maintain even soil moisture – the key to preventing cracked fruits and blossom-end rot. Make watering easier by using soaker hoses around the plants and covering with mulch.
As summer heats up, some tomatoes have trouble setting fruit. Be patient, and you will start seeing little green tomatoes again when nights begin cooling down.
Meanwhile, promptly harvest ripe tomatoes to relieve stressed plants of their heavy burden. If you live in an area where summertime temperatures are typically in the 30s, be sure to choose some heat-tolerant tomato varieties bred for their ability to set fruit under high temperatures.
By late summer, plants that began producing early in the season will show signs of exhaustion. You can rescue those sad tomato plants. It will take but a few minutes to coax out new growth by pruning away withered leaves and branches. Then follow up with liquid fertilizer and treatments for leaf diseases or insects, if needed.
Humid weather creates ideal conditions for fungal diseases like early blight, which causes dark spots to first form on lower leaves. Late blight is a more devastating disease that kills plants quickly; the only way to control it is to protect against it by spraying the leaves with an approved fungicide such as chlorothalonil or copper and to keep the garden clean of tomato and potato debris. Of all crops, tomatoes are the most likely to get problems, but many hybrids have been developed that resists the worst or most prevalent diseases.
Check your variety description in our online catalog to see what diseases it might be resistant to. Often diseases tend to be worse in one region of the country and practically non-existant in another, which is why it’s important to have varieties suited to your area. In mid-summer, big green caterpillars called tomato hornworms eat tomato foliage and sometimes damage fruits. One or two hornworms can strip a plant leafless.
Harvest and storage
As tomatoes begin to ripen, their colour changes from vibrant medium-green to a lighter shade, with faint pink or yellow stripes. These “breakers,” or mature green tomatoes, can be chopped into salsas, pickled, or pan-fried into a crispy appetizer. Yet tomato flavours become much more complex as the fruits ripen, so you have good reason to wait.
The exact signs of ripeness vary with variety, but in general, perfectly ripe tomatoes show deep colour yet still feel firm when gently squeezed. Store picked tomatoes at room temperature indoors, or in a shady place outside.
We don't recommend storing tomatoes in your refrigerator. This is because temperatures below 12°C (55°F) cause their precious flavour compounds to break down.