I had 20 strawberry plants delivered from Dobies on 27th May and planted them out the same day - they're in a strawberry planter.

They were all tiny crowns when they arrived, rather than plants, but seemed to be getting going OK, producing a few green leaves. Then we were on holiday last week and when my friend came to water everything on Wednesday, she said that all but 2 of the strawberries had 'disappeared'. We couldn't figure out what she meant until we got home, but most of the plants have just withered up and died. 2 of the plants are small but OK and starting to flower.

What's happened?! Is it something we've done (too much water, too little water?) or should I be complaining to Dobies about it?