Blossoming Questions

We planted a Shining Sensation Weigela about a month ago & it’s doing well. However, it has stopped blooming & no sign of any upcoming blooms. The person at the nursery said it would bloom on & off all summer. It’s in partial sun – healthy except for not blooming.
I have four Endless summer hydrangeas that are about 5 years old. Planted in various areas of sun to partial sun in our yard. I rarely get blooms. This year I got one bloom of all four plants. I cut them down in the fall as I thought this was the variety that bloomed on new wood. Is this the problem?
I just bought 2 of “The Original” and noticed some of blooms are turning brown. I’m not sure if I’m adding too much water or not enough water. They are planted in containers with good drainage and the soil is moist. They now only get morning sun. I just moved them so they aren’t getting sun all day long. Suggestions would be appreciated! I live in NY.

I planted my Endless Summer Hydrangea about 2 weeks ago and it did really well for the first week and now it’s becoming less and less healthy.
 When I planted the hydrangea the tag said it would tolerate full or partial sun, so I planted it an area that receives full sun for about 10 hours a day. I also put a small amount of the fertilizer into the hole. I have watered it well daily since i planted it. The leaves and blooms are turning purplish and then brown and dry. I trimmed the dead leaves and blooms off very carefully and it’s continuously declining.
I’m thinking I should transplant it to an area with more shade and am wondering if this would be ok to do if it’s done at a time of day that is not sunny and hot.
I JUST RECEIVED AN ENDLESS SUMMER HYDRANGEA FOR MOTHER’S DAY. SHOULD WE PLANT IT RIGHT AWAY OR CAN WE PUT IT IN A POT? IF WE PUT IT IN A POT WHEN CAN WE PUT IT IN THE GROUND? ALSO, IN IOWA, HOW MUCH SHADE IS PARTIAL SHADE?
WHY ARE THE LEAVES ON MY PARKLAND PILLAR BIRCH YELLOW?
WHAT FLOWERING PLANTS CAN I PLANT IN FULL SHADE?