I don't even try to zone jump anymore & so tropicals are not in the picture for me since we moved here to north Fl. (We used to live in Zone 10 Fl.)
Last year, I planted dl's in May & June & they did fine but it was rough on me.
AND I will say they do better overall when planted in the fall b/c I did plant some in fall last year. The ones I planted in May & June last year did need a bit of babying through summer. The ones planted in fall just stuck their feet in & were happy from day one.
But I'm happy to be here in zone 8 where it's not an inferno year round like it was in zone 10 all my life.