Flower arranging in Latin

I have been reading through my Loeb English/Latin bilingual Virgil version, to brush up my Latin, and in it I have found 4 passing references to an unexpected subject: flower arranging (rather than merely mentioning flowers):-

Aeneid XII, lines 68-69

… aut mixta rubent ubi lilia multa
alba rosa,

Ciris, lines 95-98

munere saepe meo inficiunt foribusque hyacinthi
deponunt flores aut suave rubens narcissus
aut crocus alterna coniungens lilia caltha
sparsaque liminibus floret rosa

Copa, lines 13-14

sunt etiam croceo violae de flore corollae
sertaque purpurea lutea mixta rosa

Eclogues II, lines 45-50

… tibi lilia plenis
ecce ferunt nymphae calathis; tibi candida Nais,
pallentis violas et summa papavera carpens,
narcissum et florem iungit bene olentis anethi;
tum casia atque aliis intexens suavibus herbis
mollia luteola pingit vaccinia calta.