We had found many tent worms in our Pansy flowers beds and would like to get rid of them.
If it is indeed the work of tent worms, you'll have to locate the nest in order to stop or prevent their damage. This article will provide more info: https://www.gardeningknowhow.com/problems/pests/tent-worms-tent-caterpillar-home-remedy.htm
How much water does a pansy need every day?
That really depends on how and where they are planted. If in the ground, 2" of water a week. If in a container, they will need to be watered once a day normally and twice a day when the temps go above 80F.
Can pansies smell like cucumbers?
I am not sure...I think this is more a matter of individual perception. What one person smells will be different than what someone else smells. I do know that borage plants are said to both taste and smell like cucumbers.
I'm in northern Ireland and my pansies and violas are still in bloom. Will they grow again next year or will I just throw them out? I have all my summer bedding ready to plant.
They technically can in milder climates but do not often come back a second year. In moderate climates, they sometimes will reseed themselves. It is best to plan on them only living the one season.
Every year I plant my annual Pansies and the like. As time goes by, their roots end up being eaten. We have dug up old soil and put down new fresh soil, yet, something is still eating the roots of the flowers.
As you didn't mention what the root eaters look like, this is some general information:
How do you care for pansies in cold temperatures?
Pansies can pretty much take care of themselves in the cold. watering the ground before a particularly cold snap can help prolong them a bit when the really cold weather sets in, but other than that they really need no special care.
I have been told that pansies will repel raccoons, opossums, etc. Can you tell?
While I personally have not heard of this, one never knows so it doesn't hurt to try. As for issues with raccoons or opossums, these articles may also help with suggestions: https://www.gardeningknowhow.com/plant-problems/pests/animals/getting-rid-raccoons.htm