Here is the BEST Time to Plant Amaranthus in Washington (2023 Guide)

Do you want to grow amaranthus in Washington, but don’t know when to plant them?

Planting amaranthus is not as easy as it seems.

Here’s why:

  • Amaranthus 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 amaranthus won’t produce a bloom.

Today, I’m going to teach you the ideal time to plant amaranthus in Washington:

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

When to Plant Amaranthus in Washington

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 amaranthus outside in Washington!

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

Washington Last & First Frost Dates

washington 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 amaranthus planted outside in Washington 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 amaranthus?

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

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

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

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

When Should You Start Your Amaranthus Seeds Indoors?

Depending on the type of amaranthus, it takes roughly 42-56 days (6 to 8 weeks) to grow amaranthus from seed indoors and then transplant them to your garden. And then another 12 weeks to bloom!

For a specific date that you should start amaranthus seeds indoors you should:

  • Find the last average frost date HERE
  • And then subtract 42 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 amaranthus 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 amaranthus plant, increasing its chances of fighting off diseases, insects, droughts, and wet conditions.

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

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