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linnea56chgo5b

How much moisture for trilliums and jack in the pulpit?

linnea56 (zone 5b Chicago)
7 years ago
last modified: 7 years ago

I recently ordered
some woodland flowers: Jack in the pulpit, and 3 kinds of trillium: white grandiflorum, red Trillium Erectum, and yellow Trillium t. Luteum.

I already grow an Illinois native red trillium (a different red one with
spotted leaves, whose name I don’t know). So I figure the others will like the same
conditions. Also thriving there are native ferns, Virginia bluebells, geraniums,
and (not natives): daffodils and hosta.

But I turned out to have less space in my little woodland garden than I
thought. This is not a “real” woodland, just a strip I have developed as one,
under ash trees and spruces. Extra bulbs will have to go in one of my other beds.
Unless I should plant them closer…? So far, I am planting in clusters about 4
inches apart.

What I can’t seem to find is how much moisture they really need. I have lots of other shady spots but they are
more moist than my “woodland”. Also under overhanging trees. I spent quite a
bit on these and want them to thrive.

One is in a low spot where there is occasionally standing water after a
heavy rain, which can take a few hours to really soak in. So far, the hostas,
geraniums and hydrangeas are handling the wet okay. But they have not been
there long enough for me to really tell (2 years for the oak leaf hydrangea). But
I am not sure how well the trilliums can tolerate it.

Another that is not as wet is in a shade bed that is mostly hostas, ferns, and
astilbe. That one has had a lot of heucheras
not come back after winter, I think because it is too moist. Survivors are
those of villosa parentage, like Tiramisu and Citronelle.

A third alternative is under a limbed-back aborvitae. That is shady but much drier. A very slight slope, so no standing water. All I am growing there so far are 3 hydrangeas: Lemon Daddy, and 2 Twist and Shout (endless summer cultivar).

(cross post to Woodlands) Thanks for your advice!

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