Anyone who has a greenish thumb and tastes fresh herbs should try growing coriander. The whole plant – from seed to germ, leaf and flower – is edible. Coriander is also delicious as a micro green, but it can also be left to ripen for a spicy harvest. And for many gardeners, the herb grows better indoors than outdoors. So if you’re looking for a good candidate for your window grass garden, consider coriander. You will soon learn how to grow coriander from seed.
BEFORE YOU BEGIN
Coriander is a cool seasonal plant that does not grow back quickly after harvest. To provide a constant supply of fresh coriander, plant a few seeds every week or two.
The instructions below show how to plant coriander seeds to grow mature plants. If you want to grow coriander green, replace the standard pots with an open plastic growing tray (not broken down into cells), scatter the seeds over the entire surface of the soil and push the seeds into the soil without covering them.
An alternative way to grow full-size coriander plants is to make rooted cuttings from existing plants. This can be a useful way to provide a continuous supply of coriander. As this method requires starting plants, please continue reading.
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STEP 1: Choose a place to grow coriander indoors.
Coriander is a sun-loving plant that suffers from inadequate light. For best results, choose a very sunny indoor location, such as an unobstructed south-facing window. Coriander grows well even under strong lighting. If you do not have a sunny window, use a broad-spectrum LED, HID, or fluorescent lamp to ensure proper photosynthesis of the plant. Many indoor herb gardens are equipped with lighting.
STEP 2: Plant coriander seeds.
Place the seeds in a small bowl and cover with cold water. Allowing to soak for up to 24 hours before planting will help speed up germination. Drain the seeds just before planting.
You can grow coriander in pots. Choose a diameter of about 8 inches for a plant or a size of 12 inches for a group of three plants. Pre-moisten the pan mixture and fill the pan (s) to the nearest 1.5 inches from the rim of the pan. Gently reinforce the ground to remove airbags.
Plant the seeds 1/4 inch deep. Place three seeds in a 1-inch triangle near the center of each 8-inch pan. Or, if you are using a 12-inch pan, make three 1-inch core triangles evenly distributed around the center of the pan. Cover lightly with additional soil and lightly spray the surface of the soil.
When the seedlings extract the second leaf, thin them down to the strongest plant in each triangle. You can use the dilutions for flavoring like mature coriander.
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STEP 3: Give the coriander even water and temperature.
Place the coriander pots in a sunny, warm place where the temperature remains above 70 degrees Fahrenheit until the seeds germinate. After germination, the plants grow well at temperatures between 50 and 80 degrees. This cool seasonal herb tolerates lower temperatures very well, even below freezing, but twists or blooms due to excessive heat above 85 degrees.
Keep the soil evenly moist but not soaked. Check the water every 2-3 days by inserting your finger into the ground. If the soil is moist at the depth of the first knuckle, watering is not necessary. When this topsoil has dried, water it thoroughly and allow the excess to drain freely. Do not allow water to stand in the plant saucer.
Humidity is not a critical factor for coriander. The average indoor humidity is adequate.
STEP 4: Provide adequate light and fertilizer.
Coriander plants need adequate sunlight to perform photosynthesis. Four hours of direct sunlight is the minimum, but the reduced intensity of autumn, winter, and spring sunlight that infiltrates through the windows may not be enough. If the color of the plant is pale green instead of deep green, adding growth lamps will help.
Place growth lamps directly above the foliage within 2 or 3 inches. Twelve hours of extra light a day is enough to keep the plant healthy.
Feed coriander regularly with a general purpose liquid plant food. Dilute according to the manufacturer’s instructions for weekly feeding. Use liquid plant food once a week instead of plain water.
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STEP 5: Harvest the indoor coriander.
Coriander can be used at any time after germination, but is usually considered “ready to harvest” at 5-7 weeks of age. Lightly trim a few outer leaves at a time when they reach 4-6 inches in length, or harvest the entire plants at once. The nice thing about growing coriander indoors is that it doesn’t take up space in the fridge. You can precisely select the amount you need at any given time and let the others continue to grow.
Once you know how to care for coriander, growing coriander indoors is a fun and easy way to move your green thumb while enjoying the taste and aroma of fresh herbs year-round. It takes up little space on a sunny windowsill and the plants thrive without being overly squeaky. Your constantly comfortable home with a controlled climate will be exactly what this plant needs to produce plenty of delicacy.