Excuse me, what tree is this? What's the gardening value?

It looks like a tall heather with red leaves.

In the spring flower season, it gives off a smell?

Photinia rubra

It is the general name of the hybrid of Photinia in Rosaceae. It is a small evergreen tree or a multi-branched shrub with single impeller, lanceolate to long lanceolate leaves, bright red new shoots and tender leaves, leathery old leaves, dark green and shiny leaf surface, green back and smooth and hairless leaves. Terminal corymb with small white flowers, flowering from early April to early May. Red pear fruit, mature in late summer, can bear fruit continuously until the following spring. ? Red robins are commonly used in gardens. Robin and red lips? "Jian" two varieties, of which the red robin leaves are more durable and bright, and more ornamental.