Starting from seed
Parsley Seed Germination for Kratky
Parsley has a reputation for being slow to sprout, and it earns it. With a little preparation, though, you can get a good, even start and have seedlings ready for a Kratky container.
Why it's slow
Why Parsley Takes So Long to Sprout
Parsley seeds typically take two to four weeks to germinate, longer than most herbs. The seed coat is hard and contains natural compounds that hold germination back until the seed has been wet for a while. In the wild, that stops seed sprouting after a brief shower.
The good news is that soaking washes some of those compounds out and softens the coat, so the wait gets shorter and the sprouting more even. This page covers the start; the main Kratky parsley guide covers growing it on.
2-4weeks to sprout
Step by step
How to Germinate Parsley Seed for Kratky
Soak the seed
Soak the seed in warm water for 12 to 24 hours. Change the water once if it turns cloudy.
Use starter cubes
Soak rockwool cubes or starter plugs, then sow two or three seeds in each, about a quarter inch deep.
Keep warm and moist
Keep the cubes around 70°F and never let them dry out. A clear cover holds in humidity; lift it daily for air.
Give light at sprouting
As soon as the first sprouts appear, move them under bright light so they don't stretch.
Thin and transplant
Keep the strongest seedling per cube. When roots show through the bottom, set the cube in a net pot over the nutrient solution.
Moving to the container
Seedlings in the Kratky Container
Fill the container so the bottom of the net pot just touches the solution; the roots will grow down into it. For the first week, a weaker solution (about half the label strength) is gentler on young parsley roots. After that, use the normal strength for herbs.
Don't refill to the top as the level falls. The roots grow down after the solution and use the air gap above it. Parsley is a long-season herb, so it will likely need one part-way top-up before it is done.
The first harvest usually comes 70 to 90 days after sowing. Cut the outer stems at the base and let the center keep growing. Not sure which parsley to sow? Compare flat-leaf vs curly parsley.
70-90days to harvest
Troubleshooting
When Parsley Seed Won't Sprout
- Nothing after four weeks: the seed may be old. Parsley seed loses vigor after a couple of years; buy fresh seed.
- Cubes dried out: a single dry spell can stop germination. Keep them evenly moist.
- Too cold: germination slows a lot below about 60°F. A warmer spot or a seedling heat mat helps.
- Long, floppy seedlings: not enough light after sprouting. Move them closer to the light.
Planning ahead
Sowing for a Steady Parsley Supply
Because parsley takes so long to sprout and size up, plan ahead. Sow a new tray of cubes about two months before you expect your current plant to slow down. That way a young plant is ready to take over as the old one tires.
Parsley is a biennial. In its first year it makes leaves; given a cool spell and enough time it starts to send up a tall flower stalk, the leaves turn bitter and the plant is finished. In a warm indoor Kratky setup that can take many months, but when you see the center stretching upward, it is time for the next sowing.
Sow a few extra cubes every time. Spare seedlings can go into a second container, or be given away, and they cover the occasional seed that never comes up.
FAQ
Parsley Germination Questions
Is soaking parsley seed really necessary?
No, but it helps. Unsoaked seed sprouts too, just more slowly and less evenly.
Can I sow parsley straight into the net pot?
Yes, in a rockwool cube in the net pot. Starting in separate cubes first lets you pick the strongest seedlings.
Do parsley seeds need light to germinate?
No. They germinate in the dark under a thin covering; give light as soon as they sprout.
How many seeds per cube?
Two or three, then thin to the strongest one.
Can I start parsley from a cutting instead?
Not reliably. Parsley grows from a central crown and doesn't root well from stems, so seed or a young nursery plant is the way to start.
Should I use a heat mat for parsley seed?
It helps in a cool room. Keep the cubes around 70°F and remove the mat once most seeds have sprouted.
Related Parsley Guides
Choose your parsley, or read the full growing guide.