LizinElizabeth said:Mulch isn't really necessary for peonies although they advise it to help avoid heaving soil. Has anyone here ever had heaving soil??? I mulch mine but only because it's so dry here in CO, would be watering daily if I didn't. I have mulch completely covering my peonies now, mostly just pine straw so it doesn't create such a solid barrier like wood mulch, but I move it back in the spring as soon as I see signs of growth.
crawgarden said:I only mulch the first year, than remove in the spring and never mulch after that.
Oldgardenrose said:Frost heaving is a real concept but it appears to only disturb new plants until they develop their root mass. I have used metal tent pegs or pieces of steel re-bar to hold landscaping timbers in place and had them raise out of the ground 3 or 4 inches after a few years. As an example of frost heaving, the soil freezes and expands with moisture which raises the shallow plant roots. When the soil thaws and settles back to normal the roots stay elevated. One of the old iris tricks is to place a half brick or stone on top of the new rhizome to force it to settle back down with the soil.
Most of the old-timers use mulch to keep the ground frozen, not to keep it warm. Applied after the ground freezes. Prevents the normal rapid thawing and freezing in the middle temp zones such as mine 6a/6b.
kousa said:I always mulch my newly planted peonies. I have found those that I mulched performed better than those that I did not mulch the following year. When the pips start to show up in the spring, I brush the mulch away from the pips to allow them to grow. I think it really helps the new peonies esp. those planted late (Oct-Nov)to have a layer of mulch to continue to grow feeder roots until the soil is frozen. According to Cricket Hill Peony website, peonies continue to grow feeder roots if soil temp is 40F and above.
joannakat said:
RJ, you're in zone 4, is that colder or warmer than zone 5? Sorry, I'm new to all this :-)
kousa said:Peony pips
You can start brushing the mulch away when you see growths like above, probably about late March. While you are at it, you can apply a tsp of bulb fertilizer to feed the peonies then. The mulching is helpful in zone 6 or above. Warmer zones probably need a different approach.
kousa said: The mulching is helpful in zone 6 or above.
kousa said:
I mean in zone 6 or COLDER. Sorry about that.
LizinElizabeth said:Sorry Joey, you're absolutely right, what I'm referring to as pine straw is just dead pine needles. Great insulator and doesn't matt down as much as other mulches I've used, plus it's free to me from the pines on our land. I just try to take it from trees with few weeds under them! I used to get wood mulch delivered but it was expensive, heavy and was covered in pine needles within a year, anyway, so why fight nature?