What's your question? Ask

These past few cold, hard winters have been harsh not only on us but on the trees as well. A cold hard winter coupled with a cold spring sometimes is not a good combination for fostering budding/blooming on trees - it can delay the onset of budding/blooming or stop it altogether.

My best advice is to continue giving your tree TLC - guidelines on how to care for weeping cherries are in the article below. A boost of fertilizer may not be a bad idea.
https://www.gardeningknowhow.com/ornamental/trees/weeping-cherry/weeping-cherry-growing-tips.htm

The weather has definitely wreaked havoc with plant life and trees this year and the weeping cherry trees are no exception. The onset of blooming in weeping cherries is variable from year to year and is completely dictated by the weather and we did just endure a cold winter followed by a cold spring. I would give your tree some more time to snap back to life - it may just be looking for a sustained warming trend before it decides to bestow you with its flowery splendor.

For more information on the care of weeping cherry trees, please visit the following link:
https://www.gardeningknowhow.com/ornamental/trees/weeping-cherry/weeping-cherry-growing-tips.htm

Here is an article that will help you on how to deal with tent caterpillars. Good luck!

https://www.gardeningknowhow.com/plant-problems/pests/insects/tent-worms-control.htm

For more information on the care and pruning of weeping cherry trees, please visit the following links:

https://www.gardeningknowhow.com/ornamental/trees/weeping-cherry/weeping-cherry-growing-tips.htm
https://www.gardeningknowhow.com/ornamental/trees/weeping-cherry/pruning-weeping-cherry.htm

Trees can be planted in spring after the danger of frost has passed or in early fall to allow roots sufficient time to establish before the first freeze.

For more information on growing weeping cherry trees, please visit the following link:
https://www.gardeningknowhow.com/ornamental/trees/weeping-cherry/weeping-cherry-growing-tips.htm

If the only growth you are seeing is at the base, then it may be that it is a lost cause. Check the upper branches. If they are still pliable, then the tree may still recover. But if they are brittle, the tree's upper half is dead and will never regain its shape.

It would be hard to say what killed it. The tent worms likely weakened it, but they rarely kill a tree. It may have been that in a weakened state, the tree just could not cope with winter conditions (especially if you had a cold winter) or there may have been too much water in the soil or a disease or just a multitude of other issues that may have killed it.