Be advised that blood orange is a very generic term. Theres quite a few varieties, each with its own idiosyncrasies. Some are very productive under the right conditions, but others less so. Also, the 'blood' coloration is dependent on cool weather at maturity. The sensitivity of tree to these cooler temps varies fairly substantially. The grower I bought mine from (in Gilbert) advised 'Ruby' as the cultivar that most reliably develops blood coloration here in PHX. It also is a fairly productive tree. Nothing like a Tangelo or even a Valencia, but still pretty good. I got 5 or so the first year in the ground, and I would expect double that this year. The coloration isnt as strong as 'Moro', but is more reliably blood 'flecked' here with our warm winters. 'Sanguinelli' doesnt color up very well here is what Im told.
HTH,
DD
