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Is there any reason that you don't plant from your own production.
Did an RHS search and they gave thisShowing suppliers of Allium sativum 'Marco' (2 results)Mail order suppliersThese nurseries offer a mail order serviceRHS Plant Shop: RHSplants.co.ukNursery Court,London Road,Windlesham,Surrey,GU20 6LQwww.rhsplants.co.ukNursery code: LOPSOffers mail orderCrocus.co.ukNursery Court,London Road,Windlesham,Surrey,GU20 6LQwww.crocus.co.ukNursery code: LCroOffers mail orderHope this helpsThanks TEE GEE, I'll see when they send out