Ringrose tipped for bright future after maiden Leinster try
Leinster 37-13 Dragons
Leinster coach Leo Cullen said he was excited by what he saw from Garry Ringrose as the youngster dotted down in this bonus point victory at the RDS.
The 20-year-old, predominantly a centre, got a deserved try in the second half after impressing on the left wing.
Cathal Marsh also crowned a good display with Leinster's fourth try, while Isa Nacewa laid the foundations for victory with a first-half double.
"Garry acquitted himself really well - a really, really nice footballer," said Cullen. "He is playing a bit out of position on the wing, but he has shown some glimpses of what he is capable of.
"He was in at centre in the end when Noel Reid went off. He has got a good future ahead of him, hopefully," said Cullen.
Sarel Pretorious dived over for Dragons after 23 minutes but Leinster fought back to lead 20-10 at half-time. The visitors were seeking their third consecutive win over Leinster, although they had only won once in their previous 13 Pro12 trips to Dublin.
Fergus McFadden and Jason Tovey had exchanged kicks prior to that, and Nacewa's quickfire brace settled Leinster as they made it two wins from three.
It gave them their 10-point advantage at the break, and although they didn't get their third try until after the hour, they looked comfortable.
Ringrose had a couple of chances to get his first senior try, until he eventually did, in the 65th minute. Dragons looked out on their feet, and Marsh took full advantage three minutes later to put the game beyond doubt.
Leinster - I Nacewa (capt); F McFadden (C Kelleher 35-38 blood), B Te'o, N Reid (C Kelleher 69), G Ringrose; C Marsh (R Byrne 77), I Boss (L McGrath 61); M Bent (P Dooley 52), A Dundon (J Tracy 61), M Moore (J Hagan 24); R Molony, M McCarthy (T Beirne 70); D Ryan (D Leavy 63), J van der Flier, R Ruddock.
Newport Gwent Dragons - C Meyer; T Prydie, R Wardle (A Brew h-t), A Warren, A Hewitt (A O'Brien 49); J Tovey, S Pretorius (L Jones 67); B Stankovich (P Price 54-63 blood & 67), H Gustafson (E Dee 54), B Harris (S Knight 63); N Crosswell, R Landman; J Thomas (M Screech h-t), J Benjamin (N Cudd 54), E Jackson.
Ref - I Davies (WRU).