Jacks can grow in very moist/wet areas, but Trilliums do better in the aforementioned moist but well drained. Do you have a place on a slope, so that the moisture will drain off?

Thank you both. My "woodland" is a raised bed, with years of organic amendments.

But the 2 other areas
where I had hoped to place the extras are not raised, and are newer, so fewer
total amendments added. Both are on a slight slope.

Do the leaves persist
all year? I have another bed where I could place them (moist but slight slope),
where not much shows at the time trilliums bloom; but I am not sure about wanting
to see the leaves once the other perennials (mostly hostas) are fully up.

Depends on which Trilliums. For me, the ones you bought do have leaves most of the summer, unless we have a drought. Other Trilliums fade away sooner. Most Trilliums I know are short enough to be "covered" by Hostas. Your sloped areas should be OK for these plants.

Thanks. When I go to the woods I only see the local native red trillium with marbled leaves, and the white grandiflorum. I don't remember seeing the leaves of these after the bloom time, so I didn't know for sure if they persisted..

T. cuneatum leaves do no persist, but some of the others do, at least, for me.

My woodland garden is very dry in a dry summer; I don't water. But I have trilliums and Jacks.

Once established, plants with rhizomes/bulbs can withstand droughts, but if you have many seasons without water, they often die. I don't water, and I have lost plants due to multiple summers with no rain. However, I think the original questions related to too much water. Again, plants don't read the books, so we often have surprises, both good and bad.

None of these have sprouted yet. They all looked very healthy when planted. ( I actually have not planted all, I ran out of open space, and have not gotten to clearing out the daffodils to plant the rest) Considering the lateness of the season, I wonder if they will. Or if they will just put out roots for now and sprout next year. I don't know much about the life cycle of these plants.

I don't know about Trilliums, but jacks CAN skip a year, though it is usual. The corms would still be firm though. You received these in May? I wonder if rather than sending you dormant plants ready to sprout in 2016 that the vendor took 2016 plants, removed the foliage and shipped. If that is the case they will not sprout until 2017 anyway. I love our native jack and have it here and there in my suburban garden, where it slowly spreads and sometimes appears in surprising places as seed gets spread around. Conditions here are "average". It certainly seems adaptable and can take some drying in midsummer where it generally dies down anyway. I have a couple Trilliums but they have not done as well for me.......persisted and bloomed for many years but not really increased in size much.

It will be interesting to see if they thrive. I "hunt" native species in my woods and bring them forward to the edge of my yard/woods so I can enjoy them. I read Jacks need Oak Mold from dropped leaves to germinate. You have corms all ready to go..but I still wonder if they will be happy? I make sure my gardens get an inch a week of moisture. I have jacks that get two feet tall!!

Follow up: I had very few make it. I had ordered I think 10-20 of each, 5 of the yellow trillium. The yellow trillium did the best. I saw all of those.

Of course I want the white the most. :( 2 of the white, but the flower is smaller, so I don't think it IS grandiflorum. I had a few jacks already given by friends, so I don't know if the ones I saw are the new or the old, but I suspect the old.

I believe squirrels dug up and ate the rest. I didn't think they ate these, so I had not protected them with wire mesh like I do my tulips. I'm thinking about re-ordering, but would like to know the optimum time to do so.

As a consolation, I offer this story: This season I ordered 25 Trillium luteums, and I did not see a single one come up! I emailed the dealer, and he asked me if the rhizomes had put out roots. I was not going to dig up my plants, but I had potted up several, as I usually do when getting a large order. I turned the pot upside down, slipped out the soil, and there were lovely long, white roots growing. He said they would come up next year, so here's hoping that is true and maybe you will see a few more from yours, too.

And I usually get my Trillums in very early spring, say the beginning of March and plant out immediately.

Thanks! Being ephemeral, I wondered if it was even possible for a dealer to find them later in the year to dig and sell. I will plan on ordering very early in the spring. I am in zone 5b. I had ordered mine in early May of 2016. Could be that interrupted their life cycle too much.

Some of my botanist buddies swear by transplanting when Triliums are in bloom, but that way you have to buy large plants, and they are quite expensive. I have moved Trilliums from plant rescue sites almost every month of the year and had some success, but when you have multiples, it is difficult to quantify that success. All that I have bought I order in February with the idea of planting in March. Hope you find some success in the future.