That sounds like a fragrant tea olive - osmanthus fragrans. Smells almost like bubble-yum bubblegum. They're really more like a shrub when they're small but you can limb them up into tree form. They grow to maybe 25 ft tall. Green, slick leaves with tiny white buds. You can smell them from a mile away and they're the best smelling thing I've ever smelled outside. Honeysuckle, jasmine, etc. don't even come close to the scent of a fragrant tea olive.

as a hosta gardener ... here are my thoughts under old trees .. just a list.. dont take it as editorial ... never till... dig only holes needed [the least amount of root cutting] ... and plant in what you dug out ... native soil.. and near bare root the plants ... cut roots.. reply by making more.. more aggressive ... feeder roots and invade planting holes.. and can chole out the plants you want ... always broadcast water.. never water just the plant.. else where do you think the tree will put all those new feeder roots ... same logic with ferts ... lawnsprinklers.. will NEVER water deep enough to moisten soil under such.. unless you have a specific zone for such;.. and run it for hours on end.. and dig holes.. to find out if and when you have water to at least 3 inches deep.. and then you water to maintain said moisture at that depth ... presuming that is where the roots of the plant you are putting there are ... a little surface moisture will not help a plant get 'established' i would have used round up to kill the grass.. rather than shaving off the first 2 or 3 inches of roots ... see above as to why .. new feeder roots ... well.. thats what i can think of off the top of my head ... you can grow things there ... but figuring out.. how to keep a transplant watered.. until it can compete.. is how you are going to win ... many things can handle drought.. but dont forget.. its the planting.. the time to get 'established' .. that dictates how successful you are ... you might have to water the grasses.. every week especially during the heat of summer.. in the year of planting... and maybe next year.. in drought .. and THEN.. they will become rather bulletproof ... the usual rule is.. insert finger.. and find out when they need water.. rather than relying on a schedule ... or an automated system ... good luck ken

'Should I be pruning it?' You only need to prune ornamentals if there is a good reason, eg dead wood, disease, poor shape, etc. Since your tree is healthy and beautiful and has remained so for 7 years without attention there is no reason to start chopping at it now.

I am aware that 4 planted together need to be split up and are hearty outdoor worthy, (can I leave them in a sheltered area till spring?) ===>>> big city name please .... leaving them in a pot... for winter.. is so problematic.. that many peeps with many years of experience... can fail at it ... depending where you are ... the norfolk has to stay indoors... if you have a forced air furnace .... in other words.. depending where you are .... try to place it away from the constant dry air coming from the furnace .... probably the same for the olive .... winter watering is also tricky .... with the sun in decline.. most plants are in slow motion.. even indoors... so try to let them near dry in between waterings ... and do not fert a plant that is in slow motion ... ken