Crown flower is a giant milkweed. It is a large shrub or tree up to 20 ft tall. It is not as invasive as other milkweeds like other asclepias. The flowers are used to make lei. It is the favorite food plant of monarchs and anyone who has one in the yard will have it be ravaged bare by butterflies in the summer. In fact people have to protect young plants in a cage so it has a chance to get big enough before the caterpillars devour it. Butterflies are not as fussy about the nectar flowers although different butterfly species do have their favorites. They have longer tongues than honeybees so they like things like red tubular flowers that bees cannot really see. They also like things like honeysuckle, and other vine flowers that have a trumpet shape, tithonia, alyssum, penta, morning glory, and all the flowers in the labaiatae and composite families. Unfortunately they particularly like the cabbages.
I did have a butterfly bush, but I had to get rid of it. It smells very sweet and I like the deep violet purple flowers but I could not keep the butterflies away with it in the yard. They don't eat the leaves of the butterfly bush, they only come for the nectar, but they will go after the kale instead.
The other common butterfly I see is the passion butterfly that likes to hang around passion fruit vines. Actually it is a Gulf Fritillary. Still looks like a butterfly to me. If your passion fruit isn't making fruit, you probably don't have these guys around.
Fiery skippers and the cabbage white butterflies are pests. I have sphinx moths as well, but beside being big and scary, they don't do nearly as much damage in my yard.
Lantana does attract a lot of pollinators including bees and butterflies. Problem is that it is very invasive. The newer cultivars of lantana were bred to be seedless so they are of little value as they do not provide pollen (protein) source for pollinators. I am not sure if they have nectar and these are unscented. The problem with pollinators, their favorite plants are actually weeds and they help pollinate and spread the weeds.
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