Chard seeds often come in clusters of two to three seeds, so some thinning will likely be necessary. Plant seeds about 1/2 to 3/4 inch deep and 2 to 4 inches apart. If you have seedlings, plant them about 4 to 8 inches apart. You can always harvest young plants if you don’t thin enough and things get crowded. It’s best to cut plants instead of pulling them when thinning, so you don’t disturb the roots of the remaining plants.
Swiss Chard Care
Light
Swiss chard will tolerate partial shade, but it does best in full sun. Roughly four to six hours of direct sunlight on most days is ideal.
Soil
This plant likes an organically rich soil with good drainage. It prefers a slightly acidic soil pH, though it will tolerate a more neutral soil as well.
Water
Keep the soil evenly moist but not soggy. A layer of mulch around the plants can help to retain soil moisture.
Temperature and Humidity
Chard can overwinter in USDA hardiness zones 6 to 10. But it is still only a biennial in these zones, so it will go to seed quickly in its second year. It also can be grown as an annual in zones 3 to 10. It can take a light frost, but you will lose your plants if the temperature dips below freezing for more than a brief period. Humidity typically isn’t an issue as long as its moisture needs are being met and there’s good air circulation around the plants.
Fertilizer
A mid-season side dressing of compost or manure will keep chard plants fed. If you have poor soil fertilize with an organic vegetable fertilizer, following label instructions.
Swiss Chard Varieties
There are multiple varieties of Swiss chard, including:
‘Five Color’: Also called ‘Rainbow’, its leaves and stems come in a rainbow of colors.‘Fordhook Giant’: This variety has great flavor and is a vigorous grower with greenish-white leaves.‘Perpetual’: This variety tastes very similar to spinach, and it regrows leaves quickly as outer leaves are harvested.
Harvesting Swiss Chard
Most Swiss chard varieties are ready to harvest in 50 to 60 days. It’s best to harvest while the leaves are still glossy, snapping two or three leaves off the outside of each plant. If you don’t disrupt the crown it will fill back in with more leaves. While Swiss chard is commonly considered a cooking green, young chard is also very delicious when eaten fresh. To enjoy your harvest, you can chop it up in salad or lightly cook it as a wonderful side dish. Chard also makes a hearty replacement for spinach, and the stems can be grilled or roasted in place of asparagus. Keep freshly harvested leaves in the refrigerator, and aim to use them within a few days. Chard can also be blanched and frozen for later use, just like spinach.
How to Grow Swiss Chard in Pots
Swiss chard is fairly easy to grow in containers. The pot doesn’t have to be especially deep, as the plants have pretty shallow roots. Just make sure to space plants apart based on their mature size if you’ll have multiple chard plants in a container. Also, the container should have adequate drainage holes. Use a quality organic potting mix, and keep the soil lightly moist and never waterlogged.
Common Pests & Diseases
One of the biggest pests of Swiss chard is deer. Although it’s not a favorite plant, they will eat it when there’s not much else available, especially in the fall. Slugs will also chomp on chard; they’ll put holes in the leaves and tunnel into the ribs. Furthermore, leaf spot can cause brown patches on the leaves. Providing good airflow and removing affected leaves will help to keep this disease to a minimum.
