Here is the BEST Time to Plant Cardinal Flower in Iowa (2022 Guide)

Do you want to grow cardinal flower in Iowa, but don’t know when to plant them?

Planting cardinal flower is not as easy as it seems.

Here’s why:

  • Cardinal Flower are not able to survive frost or cold weather under 50 degrees Fahrenheit.

So if you plant them outside too early in the spring they will die. And if you plant them too late, your cardinal flower won’t produce a bloom.

Today, I’m going to teach you the ideal time to plant cardinal flower in Iowa:

  • To Learn More About HOW to Grow Cardinal Flower, Check Out This GUIDE!

When to Plant Cardinal Flower in Iowa

As you may have already guessed, you need to pay very close attention to your local weather in the spring. Specifically, you are going to need to watch when the last frost occurs.

In general, when there hasn’t been a frost for two weeks, you are SAFE to plant your cardinal flower outside in Iowa!

For your reference, I have created this table for average frost dates for most major cities in Iowa. If your city is not listed below you can find its Last & First Frost Dates HERE.

Iowa Last & First Frost Dates

Iowa Frost DAtes

Unfortunately, Mother Nature plays cruel tricks on us every year.

It should be noted that the above dates are just averages.

There are years when the last frost comes MUCH later. Sometimes, the last frost happens much earlier and you can get your cardinal flower planted outside in Iowa much quicker.

Like I said before, you need to be very diligent in checking your local weather.

So what happens if a frost comes AFTER you plant your cardinal flower?

When you know a frost is coming you need to take action.

  • If cardinal flower are in pots, bring them inside
  • If cardinal flower are in the ground, cover them in burlap and hope they survive

Also, make sure not to plant your cardinal flower in your garden too late.

  • Planting cardinal flower too late will cause small blooms or even worse, no blooms.

When Should You Start Your Cardinal Flower Seeds Indoors?

Depending on the type of cardinal flower, it takes roughly 14 days (2 weeks) to grow cardinal flower from seed indoors and then transplant them to your garden. And then another 720 days to bloom!

For a specific date that you should start cardinal flower seeds indoors you should:

  • Find the last average frost date HERE
  • And then subtract 14 days from it

Not only this, but I recommend again paying close attention to your local weather report.

It should also be noted that the best technique for bringing your cardinal flower plants outside is to introduce them (in their pots) outside for an hour. And then increase the amount of time they spend outside each day by an hour until they have been outside for 8 hours.

This will “harden” your cardinal flower plant, increasing its chances of fighting off diseases, insects, droughts, and wet conditions.

If you want to learn WHEN to plant ANY Flower in Iowa, head over to HERE and just type in the flower you want to grow.

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