welsh bunching onions - allium fistulosum. I grow them and think they are great as can be used liked spring onions or cooked as they are still robust enough as their flavour is a cross between onion and spring onion. i've not heard of welsh mult spring onions tho
There are 2 very different types: non-flowering, division only, often referred to as perennial or everlasting Welsh onion and the flowering ones, often referred to as 'annual' - not true - Welsh onion. This latter one can be propagated both ways, however, deteriorates with age and needs re-sowing at least every few years, hence the name, the common way of cultivation.
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