How to harvest beetroot

We had a good crop of beetroot earlier in the year which have now been harvested and either eaten: raw grated, cooked or cooked and bottled in vinegar (see my posting of 3.8.11).  

Now we're left with lots of tiny plants at the allotment, so I wondered if it's worth digging these up or leaving for a few more weeks in case they grow a bit:

One rule of thumb to apply next year is that they take about 90 days from sowing to harvesting, so will try to keep a diary of sowing.


Helpful sites including: http://www.videojug.com/film/how-to-harvest-beetroot


BBC site (probably designed for children and complete novices): http://www.bbc.co.uk/gardening/digin/vegetables/beetroot.shtml