Listen to your momma Comfrey..
Honestly...
They are a very hardy plant...
And enjoy the cold more than the heat..
*as Njoynit finds out*
Anddddddd to add more insult to injury,
when you add mulch around them,
and don't pull it back later in the very early spring...
your plants may come up thru it, but more than
likely will NOT flower...
cause they have to be at a certain height,
or depth from the top of the soil....
For them to produce flowers..
anything more on top and they struggle..
And I agree with Cricket, I do the same,
I do nothing except admire them and smell them...
No water, fertilizers, mulch, nothing....
Mine are also in several growing places, like Crickets...
y the house, out in back, in the sun and in the shade..so.....
go off and give your attention to something else that really needs your time...