Hi! We moved into a new house at the beginning of winter, and now we have 4 trees in our yard that we can't identify. I think one of them might be a cherry tree but I'm not sure. The tree in the last picture has 5 petal flowers that fold back to make a bell-like shape. If anyone knows what these are, I'd really appreciate the information, thank you!
1. Sambucus perhaps; bear in mind that there are cultivars as well as species, and cultivars may have leaves atypical of their species. You'd need to bear in mind fruit colour in your considerations, so you might have to wait a while before firming-up any ID you make.
There are other possibilities, such as Spiraea, but check Sambucus first - find some good photos of Sambucus flowers and check them in detail against yours.
2. Apple, Malus sp., unknown cultivar.
Again, the fruit might help you make an ID. ...In principle. ...Trouble is, there are so many cultivars...
The RHS offer fruit ID services at some of their gardens during summer/autumn, eg. Wisley in Surrey. If you have one near you, they might be able to help.
3. Wayfaring tree, Viburnum lantana (almost certainly, though there are quite a lot of species and cultivars).
It is a British native, and as you'll see from this map, it is commonest in the SE
4. Guelder rose, Viburnum opulus
5. Yes - a flowering cherry, probably grafted atop a standard rootstock (head height).
Again, there are a lot of cultivars, but by way of non-fastigiate pink doubles, the old 'Kanzan' is a possibility (Prunus serrulata 'Kanzan'); or maybe 'Accolade', or 'Pink Perfection'.
I can't quite tell from the photo, but if those are suckers around the base, they need removing (because they will not be of the cultivar you see giving the flowers).
Pull them off if possible, tugging downwards so the shoots tear off at the trunk (you may need to excavate a bit of soil). Pulling stands a better chance of removing basal buds. If you were to cut/saw them off, there's a fair chance you'd leave some of those basal buds, which would readily re-shoot, getting you back to the current situation. If you were to let them grow, they'd disfigure the intended form of the tree and eventually they would dominate the whole tree.
My Mum & Dad had one of these in the front garden in Leatherhead and, as a toddler, I used to delight in looking skywards and watching the petals fall, like a cloud of candyfloss butterflies, tumbling in the breeze on a sunny day. I would run around the lawn trying to catch some. The lawn itself would become a sumptuous pink and green carpet. One of the joys of spring.