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How/When to divide Brunnera 'Jack Frost'?

Posted by mscanthus 5 (My Page) on
Wed, Oct 7, 09 at 14:21

I have 3 very large Jack Frost Brunnera and I would like to divide them. The only info I find tells me to divide in winter.I live in Rochester,NY and the ground is frozen here in winter. Has anyone had success dividing these?

Follow-Up Postings:

RE: How/When to divide Brunnera 'Jack Frost'?

I've had good luck just splitting them with a trowel and replanting them. I've done this in the summer.

RE: How/When to divide Brunnera 'Jack Frost'?

I'd wait until spring now, sometime in April when the new growth appears.

RE: How/When to divide Brunnera 'Jack Frost'?

  • Posted by mxk3 z5b/6 MI (My Page) on
    Wed, Oct 7, 09 at 18:06

You can do it now. Fall is optimal time for planting/transplanting/dividing - cool days, warm soil = perfect conditions for root growth.

If you do decide to do it in spring, I would wait until after it blooms; if you divide before it blooms, you may end up sacrificing the display for the season.

RE: How/When to divide Brunnera 'Jack Frost'?

You should be fine to divide now. I divided one last year in late September to see what the results would be this year. The division was about 3/4 to 1/4. The 1/4 piece was the one moved, but the 3/4 piece stayed in it's original place. Here it is in July of this year - the biggest one in the back. Please pardon it's seedlings which I planted in front out of curiosity. :O) As you can see some of the seedlings do not come true but could add value to other sections of the gardens next year.


I am north of you in Nova Scotia, Canada, so you should be fine doing it now.

RE: How/When to divide Brunnera 'Jack Frost'?

I divided Jack last fall and they were fine this year. I also left one undivided and it bloomed a bit more than the others this year. but other than that they were all great.

go for it! As with all divisions, be sure to prepare the soil well and water well.

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