Do you want to grow watercress seeds in Iowa, but don’t know when to start them?
Starting watercress seeds is not as easy as it seems.
- Watercress Seeds must be consistenly watered, receive at least 8 hours of sunlight a day, & be kept at room temperature of at least 70 degrees Fahrenheit.
So if you don’t consistently water them they won’t germinate. If they aren’t in a room that is at least 70 degrees Fahrenheit they won’t sprout. And if it receives 8 hours of sunlight the plant itself won’t grow.
- Because Iowa’s growing season is not long enough, watercress seeds cannot be sowed outside and should only be started indoors.
Because of this, I’m going to teach you the ideal time to start watercress seeds indoors in Iowa:
- To Learn More About HOW to Grow Watercress, Check Out This GUIDE!
When to Start Watercress Seeds Indoors
Depending on the type of watercress, it takes roughly 21 days (3 weeks) to grow watercress from seed indoors before you can transplant them into your garden.
The approximate date of when you should start your watercress seeds indoors can be found by:
- Finding the last average frost date HERE
- And then subtract 21 days from it
You can also find the average last frost date for most major cities in the below chart that I have created:
To help ensure the greatest success of your watercress seeds germinating you should:
- Use a heat mat to ensure the gardening pot remains at 70 degrees Fahrenheit
- Use a grow light to control how much light your watercress seeds receive
- Water your seeds with a spray bottle to ensure your seeds are not overwatered
It should also be noted that you will not want to introduce your watercress plants into your garden until 2 weeks after your last frost or else your plant will potentially die or not bear vegetables.
If you want to learn WHEN to start ANY Vegetable Seed in Iowa, head over to HERE and just type in the vegetable you want to grow.