Kale usually takes about 65 to 80 days from seed to harvest, but that depends on variety, conditions, etc. Plants sometimes slow their growth if they are stressed, such as temperatures too hot or cold, not enough water, pests or diseases, or crowded roots (for container-grown). Make sure your plants have enough room in their pots, and that they are getting the right amount of light, water, and nutrients. It sounds like you can start harvesting the outer leaves now for cooking, but allow the inner ones to keep growing (sometimes people harvest a few baby leaves for salad, but be careful not to pick the growing innermost section). Depending on your climate, they can produce for several months, and over winter in Zones 7 to 9. If you live in a cold climate, you’ll need to provide winter protection to extend the season.
Kale usually takes about 65 to 80 days from seed to harvest, but that depends on variety, conditions, etc. Plants sometimes slow their growth if they are stressed, such as temperatures too hot or cold, not enough water, pests or diseases, or crowded roots (for container-grown). Make sure your plants have enough room in their pots, and that they are getting the right amount of light, water, and nutrients. It sounds like you can start harvesting the outer leaves now for cooking, but allow the inner ones to keep growing (sometimes people harvest a few baby leaves for salad, but be careful not to pick the growing innermost section). Depending on your climate, they can produce for several months, and over winter in Zones 7 to 9. If you live in a cold climate, you’ll need to provide winter protection to extend the season.