Eoin Morgan conceded England failed to adapt on a bouncy St Lucia pitch after slumping to 113 all out in the final one-day international in the series against West Indies.

The tourists had smashed 418-6 in Grenada on Wednesday but were unable to cope against the home team's four-man pace attack three days later, their innings lasting 28.1 overs as the final five wickets went down for two runs.

Chris Gayle hammered 77 from just 27 deliveries to help the Windies canter to a seven-wicket victory with 227 balls to spare, meaning the five-match series ended in a 2-2 draw after one fixture was washed out.

For Morgan, the performance raised concerns over his team's ability to change from their normal aggressive approach when conditions may not necessarily suit, albeit they will have home advantage for this year's Cricket World Cup.

"We struggled throughout the whole innings with the bat when it came to adapting to conditions," the England skipper said at the presentation ceremony.

"An extra bit of bounce in the wicket is not something we come up against very often and we struggled massively on it.

"We were way off the ball and the West Indies forced a lot of errors from us. It was a one-horse race – we didn't deserve to win the game. 

"It's quite difficult to curb what has been your natural reaction for the last couple of weeks. The honest answer is we need to get better at it.  

"When we come up in different conditions it is never easy for any side, but you need to adapt on the day and find a way to score runs, occupy the crease and manage the innings better than we did. 

"We've done it on slower, lower wickets, on turning wickets too, but we are yet to do it on a wicket like [this one]. 

"I'd like to think that we can learn from the mistakes we've made and look forward, rather than back."

Head coach Trevor Bayliss was disappointed with the decision-making from England's much-hyped top order, with the majority dismissed when attempting to take on short deliveries.

"It was a poor performance. Some woeful shots and after that we were never in the game," Bayliss told Sky Sports.

"We didn't adapt at all. We found during the Test series that bouncy wicket are our Achilles heel. We don't get to often play on those type of wickets in England, so it's not a strength of ours."