Common lilac 'Purple'

Blooming may be retarded by too much nitrogen – such as lawn fertilizer. Will grow in less than full sun, but bloom is diminished and susceptible to mildew

Try to plant in a location that enjoys full sun and remember to water moderately. Keep in mind when planting that Purple is thought of as hardy, so this plant will survive close to or on freezing temperatures. Purple needs a loamy and clay soil with a ph of 6.0 to 7.5 (weakly acidic soil to weakly alkaline soil).

Some varieties will self-sow.

Ensure that temperatures are mild and all chance of frost has passed before planting out, as Purple is a hardy plant.

The genus name Syringa is derived from syrinx meaning a hollow tube or pipe, and refers to the broad pith in the shoots in some species, easily hollowed out to make reed pipes and flutes in early history.

A pale purple colour is generally known as lilac after the flower.

(from Wikipedia)

The species name vulgaris is from the Latin vulgus (“the multitude, the masses”) +‎ -āris, and means “common”, “usual”, or “commonly known” ¹.

lilac

¹ Wiktionary entry for vulgaris