It inhabits lowland, moist and dry, deciduous monsoon-forest, including forest edge and patchy, dry forest/savanna, and more rarely (or at lower densities in) semi-evergreen forest, from sea-level to 1,000 m (on Flores), up to c. 900 m in Central Alor and c. 860 m in East Alor (P. Verbelen in litt. 2020), but only to 550 m on Sumbawa. It is a frugivore, and a key habitat feature may be the presence of certain species of fig (although it is known to take other fruit), particularly as it was absent from moist deciduous monsoon-forest that lacked fig trees. It may be nomadic in relation to the fruiting cycles within (and conceivably between) its island ranges. Also found in eucalyptus savannas (Trainor 2005). The species may show some tolerance of secondary habitats (Baptista et al. 2020). 

Treron floris is endemic to Nusa Tenggara, Indonesia, where it is known from the islands of Sumbawa, Flores, Besar, Solor, Lembata, Pantar and Alor, and may also occur on some other Flores Sea islands (BirdLife International 2001). Myers and Bishop (2005) revealed that records had been absent from Lombok since 1909, although a sighting was observed in 1999 near Mount Rinjani (eBird 2020). However, lowland patches on the south of the island remain unsurveyed and thus its presence on the island is uncertain (P. Verbelen in litt. 2020). It has been reported from Komodo where high elevation forest may support a small population (C. Trainor in litt. 2007). Recent records derive from Sumbawa, where it is rare and local, Flores, where it is generally uncommon but locally numerous around fruiting trees, particularly in the centre where flocks in the tens have been seen quite regularly, Lembata, where it was recorded in small numbers (2-10 birds) in 2000 and 2009 (C. Trainor in litt. 2002, 2012), Alor, where flocks of 30-50 have been observed and it may be locally common (C. Trainor in litt. 2002) and Pantar (P. Verbelen in litt. 2012). The species's stronghold is thought to be in Alor, sparsely populated near Kunggwera village and on the slopes of Mount Koya Koya in extensive tropical forests (Trainor et al. 2012). 

Conservation Actions Underway
It has been recorded recently in the Wolo Tadho Strict Nature Reserve and in Keli Mutu National Park, which is protected for its spectacular crater lakes.

Conservation Actions Proposed
Conduct surveys to clarify its distribution, status and ecological requirements, such that an effective management strategy may be compiled. Promote the establishment of appropriately sited protected areas, including at Ria on Flores, and Selalu Legini and Gunung Olet Sangenges on Sumbawa. Initiate conservation awareness campaigns on Sumbawa and Flores to elicit local support for forest protection and reduced hunting, as part of a broader strategy for conserving endemic fauna and flora on the islands. Conservation is needed in Central and East Alor (additionally benefiting other very rare birds such as Yellow-crested Cockatoo and Flores Hawk-eagle) (P. Verbelen in litt. 2020).