Originally Posted by kay

How many beans did you expect to find when you found your 3? If that was three in a 6ft row, I'd re-sow, if 3 in about a foot, then it looks as if they're coming up, but slowly. The soil isn't warm yet, but we have a week of above freezing temperatures forecast. I'd be inclined to wait a couple of weeks.

Or, if you don't mind wasting seed, you could sow a new lot in pots under cover, use them to fill in gaps where you need to.

For what it's worth, I have only just sown mine. It was far too cold in Feb, and when I got back from holiday in March, there was 6inches of snow over the garden - despite two days of sun, the last snow didn't melt till late yesterday.