Growing zinnias in zone 12
The more you cut, the more they bloom — harvest stems deep and plants branch furiously. Water at the base, not overhead, to keep powdery mildew off late-summer foliage.
Zone 12 covers hawaiʻi lowlands, Puerto Rico — tropical — timing follows wet and dry seasons rather than frost.
Make it local
These windows use zone 12's typical frost dates. For windows computed from your frost dates, run the ZIP code frost lookup and open the planting calendar — it remembers your city. The seed starting scheduler turns the whole seed rack into one printable, date-sorted list.
Frequently asked questions
When should I plant zinnias in zone 12?
Zone 12 is frost-free, so timing flips from frost-avoidance to heat management: plant zinnias nearly year-round, avoiding peak summer heat. Late winter and late summer plantings avoid fruiting during the hottest stretch.
Does zinnias grow well in zone 12?
Yes — heat-loving crops like zinnias thrive in zone 12, often across a far longer window than mainland gardens get. Watch water needs and intense midsummer sun.