Mine looks good but i am unsure when to dig it up, leaves are just begining to go slowly brown, any indication as to when.
Lift it when the stems start to flop over.
http://i283.photobucket.com/albums/kk308/trinity_house/Allotment/Garlic31May.jpg
I thought I'd try posting a photo of my garlic, taken at the end of May. Hope it works (I've had no success so far!).
I planted 4 types in October - Sprint, Corail, Arno and Cristo - 8 inches apart in alternating rows 8 inches apart and have now harvested the Sprint (Sprint by name and Sprint by nature - a very fast growing variety) and have begun harvesting the Corail. Sprint and Corail should keep until Christmas; Cristo and Arno are long dormancy varieties which should keep until spring. Some varieties have stiff stems and do not flop over when ready. You just wait until the leaves turn brown.
See http://thegarlicfarm.co.uk/ view. When 10% of foliage has 'gone over'??
But this could be White Rot symptom!!
Thanks Tim. That's a useful site. My own supplier last year, Jennifer Birch of Stroud , doesn't seem to have an internet site but does have a very helpful and informative leaflet with cultural instructions. She has won RHS awards: http://www.rhs.org.uk/Plants/documents/Garlic2004.pdf
No white rot on my garlic but a little rust on some of the plants.
If it's white rot you need to lift them fast anyway! I lifted my Purple Wight and Albigensian Wight today; everything's perfectly healthy looking despite a couple of rotten bulbs last time I grew onions in that bed. Evidently the taint of heresy was enough to drive out the fungus!