What to do? Some leaves look crinkled, and on others the leaf is eaten between the veins. It has a white cottony substance under some leaves. Have not actually seen a bug on any of the plant. What is it and how do I get rid of it?
Most likely a case of Mealybugs.
Neem Oil is a good treatment plant.
Here are links that have more information.
Is there any spring maintenance that should be done?
It's actually a very low-maintenance plant. Spring is a good time to think about cleaning out any dead growth (just like for any perennial). Here's a link to more information about Turtleheads: https://www.gardeningknowhow.com/ornamental/flowers/turtlehead/turtlehead-flower-information.htm
Do I cut off the tall dry shoots from the plant? These have dried brown buds on them. Do these survive and turn into flowers? Thank you. Annette
The dried brown buds won't turn into flowers. If the plant has already flowered, the dry seedheads will probably produce seeds soon. You can leave these in place if you like their appearance, or cut them off, it's your choice.
If the plant has not flowered, but the flower buds dried out before opening, that indicates a problem. Perhaps the plants did not get enough water or there is a problem with the roots.
the leaves of my pink turtlehead have black spots on them, turning brown and curling up on the edges. The plant is currently in bloom. We live in Blaine, Washington.
This sounds like a fungal leaf spot. You can apply fungicides to try to help. Increasing air circulation around the plants is also recommended.
Here is an article with care information.
if i live in the Midwest (missouri) and have just recieved what I think is a turtle plant, should I wait until spring to plant it in the ground or can I plant it in the fall?
No, you can plant out now!
Yes, It is a Turtlehead.
I have two turtle head plants, I want to move them and divide them.
They are very simple to divide! Just dig them up and you will notice what is each separate plant. Here is more information on the plant: https://www.gardeningknowhow.com/ornamental/flowers/turtlehead/turtlehead-flower-information.htm
I have a Pink Turtlehead plant. Can it be divided to have more grow next summer? How do I do it and when is the best time?
They divide very easily, and can be done at about any time. The best time, though, is anytime is isn't flowering: