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Fall Dahlia Care

Posted on: October 12th, 2019 by Aimee Sherrill

     Have you had freezing temperatures in your area?  With fall in full swing, we thought now is a good time to share dahlia care tips for fall.   We’re starting a series of simple blog posts, that will take you through the process of taking care of your dahlias over winter and on into spring.  Trust us to be your source for good information on proper dahlia care.  We’ve grown dahlias for almost 2 decades in 2 different climates and are experts in dahlia care, and dahlia tubers are especially our specialty.

     As we migrate from flower season, to tuber season what’s the best way to care for your dahlias right now?  Here’s some tips to help you:

If you HAVE had a freeze:

Wait until your dahlia foliage looks like this before digging in the fall

Don’t do anything for at least 1-2 weeks.  Leave them intact and let them die back and turn black, kind of like you let a tulip die back into the bulb before you cut them down.  After get an initial hard freeze, wait least 1 week before you dig your dahlias.  During this time the tuber skins are ripening and they are preparing themselves for winter.  Dahlias dug too early typically will not store over winter.

If you HAVE NOT had a freeze:

Let Mother Nature do her work and let your dahlias freeze in the garden.  Don’t cut them down, leave them intact and wait for the freeze, then wait at least one week after a freeze to dig your dahlias.  If you live in an area that does not freeze, start to withhold water from them around November 1st, then you can dig them up around mid November and store for winter.  They do appreciate a winter nap and then replant them in the spring.  The trick is to find a cool area to store them in that stays about 40-50 degrees.

Why don’t I cut them down yet?

Why go through all that extra work?  You’ll have to cut them down when you dig them up anyways.  It’s best to leave the stalk intact and do not cut down if they have not felt a freeze yet.  When you cut into a dahlia stalk, you will see that the stem is hollow.  If water gets into the stem and freezes, then refreezes it damages the tubers.  It’s best to leave them intact and sealed up so that doesn’t happen.  Plus, it confuses them and they start to grow again underground.  It doesn’t help to identify the eyes once you understand where the eye is.  It’s always in the swollen part that’s attached to last years stem.

 Why do I have to let them freeze first:

The challenges with dahlias is that they need to feel a freeze in order to properly end the season and cure their tubers. When we let our dahlias freeze in the fall, that tells the plant,

Frozen Dahlias at our Central WA farm in Thorp

“OK, it’s time to go to sleep for the winter.”  Then the stalks turn black, the energy is returned to the tubers and the tuber skins begin to thicken as the tubers are preparing themselves for winter.  It’s risky to dig your dahlias before a freeze. Dahlias dug too early have thin skins and typically do not survive the winter. They may look alright now, but usually by spring, they have shriveled to an unusable tuber.

Do I rinse off the tubers?:

We always advise to NOT RINSE your tubers with a spray hose, just tap the dirt off.  Rinsing makes it incredibly difficult to get them dry enough for winter storage, which is a key factor in getting your dahlias to survive winter storage.  If they are wet, they will rot, and there is no saving a rotten tuber.  Plus is so much extra, unnecessary work.

Do I really have to dig up my dahlias?:

If you don’t wish to dig your dahlias, that’s ok too.  For some people that just have a few growing in their yard and they are not too thrilled with the idea of digging, we always say, “Well, cut them down after they have frozen, mulch them, if they come back, Great! if they don’t, oh well just get yourself a few new tubers.”  Sometimes it’s more work that just picking up $25-$35 worth of tubers in the spring.

When is the best time to order dahlias from your farm:

NOW IS THE BEST TIME to order tubers from our farm.  Now is the time of year when you get the best selection of dahlias before we begin to sell out in early winter.  So many new dahlias on our website this year, plus perennial favorites for your garden.

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