When to Plant Parsley in Iowa (2026 Guide)
Growing parsley in Iowa offers gardeners a delightful opportunity to add this versatile herb to their culinary repertoire. With its ability to thrive in a variety of conditions and the potential for year-round harvesting, knowing when to plant is essential. In Iowa, particularly in Zone 6a, the median last spring frost is around April 25, giving a solid timeframe for starting your parsley plants.
In addition, gardeners in Zone 6b, like those in Burlington, enjoy a slightly earlier planting window with a median last frost date of April 14. This means that while you can start your parsley seeds in smaller pots indoors as early as mid-February, you can transplant them outdoors sooner in the warmer parts of the state. This fact opens up more gardening opportunities for Iowans eager to enjoy fresh parsley.</p>
While parsley is typically grown as an annual, understanding its growing habits, such as its biennial nature, is crucial for effective cultivation. This herb produces lush foliage in its first year, while its second year focuses on flowering and seed production. Thus, many gardeners in Iowa prefer starting new plants annually to ensure high-quality leaves, especially when cooking.
Planting Schedule by USDA Zone in Iowa
| Zone | Indoor start | Transplant out | Direct sow | Harvest |
|---|---|---|---|---|
| Zone 6a | Start February 15 – March 1, ~6–8 weeks before April 25 | Transplant outdoors around May 1, after frost risk has passed | Direct sow from May 1 – June 15 for continued harvest | Harvest from late May until frost, typically October 6 |
| Zone 6b | Start February 15 – March 1, ~6–8 weeks before April 14 | Transplant outdoors around April 30, once the danger of frost is over | Direct sow from April 30 – June 15 for fresh growth | Harvest from late May until frost, typically October 19 |
Parsley Planting Windows in Iowa
- Indoor start: Start parsley seeds indoors between February 15 and March 1 to ensure a robust growing season.
- Transplant outdoors: Transplant parsley outdoors in Iowa around May 1, after the last spring frost on April 25.
- Harvest: You can harvest parsley from late May until the first fall frost, typically around October 6.
Common Mistakes Growing Parsley in Iowa
- One common mistake Iowa gardeners make is assuming parsley can handle direct seeding in late spring. Due to fluctuating temperatures, especially in early April, it’s better to start parsley indoors to avoid planting too early.
- Many Iowans overlook the importance of soak seeds. Parsley seeds contain inhibitors that can delay germination. By soaking them for 24 hours before planting, you can drastically improve germination times, especially vital for those in cooler areas.
- Gardening enthusiasts in Iowa often underestimate the need for well-drained soil. With the clay-heavy soils prevalent in many regions, it’s crucial to amend soil before planting to prevent waterlogging.
- It’s also common for new gardeners to harvest too aggressively. Remember to never remove more than one-third of the plant at once; this practice allows the inner leaves to continue growing and producing.
- Lastly, many people in Iowa think they cannot grow parsley indoors during winter. However, this herb thrives in pots and can even be moved indoors to a sunny windowsill before frost arrives. This offers an opportunity for fresh herbs year-round.
Frequently Asked Questions
What if I'm in a cold pocket of Iowa?
If you're in a colder area of Iowa, consider starting parsley indoors earlier and ensuring you use protective coverings when moving them outside. This helps mitigate the effects of late spring frosts.
Can I still plant parsley in May?
You can definitely plant parsley in May, especially in Iowa, as long as you ensure that the last frost has passed. Starting seeds directly outdoors around May 1 is perfectly acceptable.
How much sunlight does parsley need?
Parsley thrives in full sun to partial shade. Aim for at least 4-6 hours of sunlight daily. In Iowa's hot summer months, some afternoon shade may help prevent the plants from bolting prematurely.
How do I prevent parsley from bolting?
To minimize the chances of parsley bolting, try to provide consistent moisture, avoid extreme temperature fluctuations, and harvest regularly. In the second year, if you want flowers, leave a few plants to bolt for beneficial insect attraction.
What is the best way to store harvested parsley?
The best way to store fresh parsley is to wrap it in a damp paper towel and place it in a plastic bag in the refrigerator. This keeps the leaves fresh for about a week. Alternatively, freeze blanched parsley for long-term storage.
Keep Learning
City guides in Iowa
Other crops in Iowa
Typical fall sowing window for Parsley in Iowa: June 30 – July 21.