my neighbor got them from Fairchild Tropical Botanic Gardens, here in South Florida during a "Go Native" workshop she attended. And these plants were just given to her.

Flower and foliage appear to be Bulltongue arrowhead, Sagittaria lancifolia. A native aquatic plant species that can be found along the East coast from DE & MD - southward and along the Gulf coast to TX & OK. Not as common as the Broadleaf arrowhead, Sagittaria latifolia, which can be found in 48 states and most of Canada. Rb Here is a link that might be useful: Sagittaria lancifolia

#1 is a sweet almond bush. You need to cut that back by half as soon as it's done blooming and start fertilizing it. #2 is Jatropha integerrima or spicy jatropha. It blooms all year long as long as you don't have a freeze, but it comes back after a freeze. #3 looks like Jatropha podagrica, but hard to tell. does it have a swollen bulbous base? May be a Jatropha gossypiifolia, but hard to tell without the leaves. This too can be cut back by half and fertilized. DO NOT eat the nuts! they're poisonous. It's nickname is The Bellyache Plant, if that tells you anything. gossypiifolia

Might just be neglect/lack of water...? It's been very, very dry here. March is usually like that. Judging from those photos, all the plants there are looking sad.