Basically, Mr A's done a part alphabetical, part normal crossword, with all the alphabetical answers being flowers. The catch is that some of the answers are hidden within other answers. E.g. ROSE in PRIMROSE and ERICA in AMERICA. The trouble with the Z answer, is there's not a single Z in any of the other solutions! So whilst ZINNIA is good, it doesn't fit my grid. So I must be missing something somewhere.
Thanks jwdd27 - that looks possible. Horribly sneaky (and clearly not properly hidden) but good enough for me to fold this one away nicely and say "thank you very much" for an enjoyable Easter puzzle