Overview of what we will cover in this article:
Liatris Seeds and Cold StratificationLiatris flowers are relatively easy to propagate and grow from seed, if they are not planted too deep and are stratified or winter-sown. The seeds from all Liatris need to go through a winter in order to germinate. So, you will have to either winter-sow the seeds or stratify the in the refrigerator in order to get a high germination percentage. You can learn a few ways to cold stratify seeds by clicking here. The University of Massachusetts has found that Liatris Spicata seeds will reach higher germination percentages (~90%) if they experience 8-10 weeks of cold moist conditions. Additionally, the time for 50% of seeds to germinate, and almost all seed germination will be greatly reduced. For another example, the University of Kentucky found Scaly Blazing star would achieve more than 90% germination when given 3 months cold stratification.
How long do Liatris seeds need to Stratify?I’ve generated the table below to show how many days are recommended for cold stratification. If you winter sow you can disregard this table (as long as it gets down to the 30’s at night). Just make sure you winter sow by January. Now, most of the number of stratification days come from seed companies. Based on the studies I quoted above, I would suggest you winter sow your seeds, and do it by January. It seems clear that the highest germination percentages will occur with longer stratification times. And you will get that with late Fall/ Early Winter sowing of seed. Besides, that is how mother nature plants these seeds, and why shouldn’t you do the same?
Liatris Stratification Reference Table
|Common Name||Scientific Name||# Days of Cold / Moist Stratification|
|Blazing Star||Liatris spicata||60|
|Prairie Blazing Star||Liatris pycnostachya||60|
|Meadow Blazing Star||Liatris ligulistylis||60|
|Button Blazing Star||Liatris aspera||60|
|Northern Blazing Star||Liatris scariosa var. nieuwlandii||60|
|Dwarf Blazing Star||Liatris cylindracea||60|
|Scaly Blazing Star||Liatris squarrosa||60|
|Dotted Blazing Star||Liatris punctata||30|
|Bottlebrush Blazing Star||Liatris mucronata||30|
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Planting Liatris Seeds – Materials RequiredNow that you have stratified seeds (or are preparing to Winter-Sow), you should gather the following materials:
- Pots – this can be a common seed starting six-pack, or even just use an old plastic container with holes drilled in the bottom for drainage
- Potting soil or seed starting mix
- Small garden shovel, or trowel
- Spray bottle for watering
- Note – If you would like to see how to save your own Liatris seeds (extremely easy), you can see our guide for how to save liatris seed here!
How to Cold Stratify Liatris SeedsYou can approach this one of two ways. The first method (my preferred) is just to winter sow the plants. You just plant them as you normally would, but keep them in a covered plastic container, or dome with holes poked in for air movement. Then, just place the seeds outside, and voila. ==>Click here to see a short video on how I prep seed flats for winter-sowing The other way to cold stratify seeds is to simulate the cold/moist winter by placing them in the refrigerator. To do this, either mix the seed with moist sand in a bag. Or you can use a moist paper towel. ==>CLICK HERE to read our guide on how to cold stratify seeds
How to plant Liatris Spicata Seeds
- Fill pots with moist potting soil, to about 1/2″ (12 mm) below the top of the pot. Your soil should be moist, and it is easiest to moisten it in a bucket before putting it into the pot. However, you can easily do it if you spray water as you add soil to the pot. You don’t want the soil sopping wet, just moist.
- Place 3-5 seeds in each pot or cell. Press them firmly into the dirt.
- Lightly cover the seeds with with just a dusting of soil, no more than 1/16″ deep (<1 mm)
- Take a few more seeds, and press firmly into the moist soil. Do this so they are exposed from the top, but have good contact with the soil everywhere else.
- Mist the seeds with a spray bottle, or pump sprayer – taking care not to wash everything out.
- Place seeds in an area where they will receive morning sun, and keep moist.
- Germination should occur once temperatures are reliably above 50F at night (if winter sown). Otherwise, you should expect seedlings within two weeks (if stratified in the refrigerator).
- Finally, you need to care for the seedlings until they are several inches high. Finally transplanting them into their final location.
- Note! Rabbits do love to eat young Liatris Plants. Consider protecting them with Liquid Fence or chicken wire the first year (at least).
Some notes about watering, and how moist should ‘moist soil’ beWhen I am germinating any seed, I generally water them in the mornings before I go to work. When the forecast calls for sunny days or hot weather, I will spray water on them until the soil is black/moist, and the pot feels heavy. That way I know I have water throughout the entire depth of soil inside the pot. When I return in the afternoon, I will check to see if they need to be watered again. If the pot feels light weight, or the top of the soil is very dry I will add more water via a pump sprayer until the pot feels somewhat ‘heavy’. I will continue this these two processes until germination. Once the seeds have germinated, and I have seedlings I will avoid watering in the afternoon, and almost never water at night. The reason I avoid this is because of something called damp-off disease. Damp-off disease is a fungus that can weaken the stems and kill the young seedling. So, to avoid this it is best to not have the seedling sit in fully saturated soil overnight.
How and When to Transplant LiatrisOnce your seedlings have grown to be 3-4″ tall, they are more than ready to be placed into their final location.
- Dig a hole to just below the depth of the pot, and twice as wide.
- Put a handful of compost at the bottom of the hole, and gently mix it in.
- Water the hole, and wait for the water to drain.
- Plant your Liatris, filling in around the pot. Pack soil firmly.
- Protect your seedling. Apply liquid fence (it really works) or put some fence around the plant and stake it.
How long does it take to grow Liatris from Seed?Generally, Liatris will not flower until it’s second year after seed germination. Liatris is a large perennial that requires significant root/corm development. Typically you won’t have any flowers the first year. It will just look like a large, leafy plant on the ground. In the rare case where you do get a bloom, it will generally be a single stalk/flower. And it will occur much later in the year than Liatris’s normal bloom time. But – the second year of life for Liatris will produce some blooms. And in the 3rd year of life, you will be treated to a massive display if planted in the flower’s preferred conditions of full sun and well drained soil. And after the 3rd year, you should consider dividing your Liatris plants to keep them looking healthy and vigorous.
Is Liatris Difficult to Grow from Seed?Liatris can be a little tricky to germinate from seed. This primarily arises from people being unfamiliar with, or not performing a cold stratification/winter sowing of Liatris Seed. Also, there are some references out there that tell you to plant the seeds deep, when you should really only lightly plant them. Surface sowing to just under the surface of soil is the proper depth for planting Liatris Seeds. PIN IT FOR LATER:
So, I hope you enjoyed this article. If you would like to learn more about a popular Liatris flower, then read our profile on Liatris Spicata here. Join our Facebook Group “Gardening With Native Plants”…for all levels of gardening enthusiasts…share, ask advice from other gardeners, enjoy this online community! JOIN OUR FACEBOOK GROUP HERE: GARDENING WITH NATIVE PLANTS FACEBOOK GROUP Be sure to check out these other articles, I think you would find useful, as well: How to Remove Sod by Hand – Our Easy Method How to Make DIY Tick Tubes Reasons to NOT Build Raised Bed Gardens Our Simple Method to Compost Native Plant Profiles Invasive Plants Find our YOUTUBE CHANNEL HERE: GROWIT BUILDIT YOUTUBE CHANNEL JOIN OUR FREE NEWSLETTER HERE. Get our new content sent to your inbox. (No worries, we won’t spam you.)
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