Sorrel is a perennial so it keeps on giving. I put one sorrel plant in my herb garden a long time ago. Sorrel and chives race each other to be the first to sprout in early spring. You could grow it as annual too!
Outdoor Sowing Tips: 1) In order to germinate, sorrel seeds prefer soil temperature between 50°F and 70°F. This means mid spring and late summer in Pittsburgh, PA.  2) Sorrel seeds should be planted 1/4″ deep. 3) The spacing for full grown sorrel is about 6 inches apart or 4 plants per square foot. If you want baby sorrel, then plant the seeds closer together.
Indoor Sowing Tips: 1) Sow the seeds 1/4″ deep in seed trays under grow lights. 2) Transplant them in the grow room once the sorrel seedling has two sets of true leaves and transplant them outside once there are between 4 and 6 leaves. I usually start my sorrel seeds indoors around 6 to 8 weeks before I transplant the sorrel in mid spring and in late summer to early fall. Don’t forget to harden off the plants before transplanting. 3) Use the spacing noted above
Growing Tips: 4) Keep sorrel seedlings and plants moist but not soggy by using a drip system. 5) If it gets hot, provide some shade. 6) No matter what I am planting in the spring and fall, I am always ready for crazy temperature swings which means I have my garden fabric and hoop tunnels ready to go.
Sorrel is a member of the Buckwheat Family and is in the Greens veggie category.
