Giant Flower Cockroach (Eucorydia dasytoides)

The first thing to say about the Giant Flower Cockroach is that almost nothing about it reads as a cockroach. An adult Eucorydia dasytoides looks far closer to a jewel beetle, its wing cases catching the light in shifting metallic blue-green, and the iridescence is the last thing you would guess from the family name. It is one of a small handful of roaches kept purely for how they look, and among Eucorydia it is the giant of the group.

That colour is not there from the start. Nymphs are drab and brownish, small and easy to overlook, and the metallic sheen only arrives with the final moult, much as it does in its smaller cousin. Freshly matured adults carry a blue-green iridescence across the body and pronotum, often lifted by orange or yellow accents on the wing covers. At 15 to 20mm they are about double the length of the more familiar Sapphire Flower Cockroach, which makes them the largest Eucorydia currently in UK culture and shows the colour off at a scale the smaller species cannot match.

The genus comes from Taiwan, China and parts of Southeast Asia, and the "Flower Cockroach" name is earned rather than decorative. In the wild, males visit flowering plants in daylight, feeding on pollen and nectar in a beetle-like way that few other roaches share. That habit shapes how you feed them in captivity, and it is part of what makes the group unusual to keep.

Housing is straightforward once a few points are respected. This is a day-active burrower, so give it a lidded enclosure with 5 to 8cm of moist but well-draining substrate, a covering of hardwood leaf litter and some cork bark for shelter. Aim for 20 to 27°C, with the warmer end encouraging faster development and a few degrees of winter cooling mirroring the natural seasonal rhythm. Keep humidity moderate, around 50 to 70%, and lean towards the drier, better-ventilated side rather than a wet, stagnant one. Ventilation is the detail keepers most often underestimate, and generous airflow matters more here than high humidity.

Escape-proofing steps up as the animals mature. Nymphs cannot climb smooth surfaces, but adults climb well and males fly readily when disturbed, so a secure lid and fine mesh over the vents become essential once they moult through. Feeding follows their flower-visiting past: fresh fruit as a mainstay, bee pollen offered regularly, and beetle jelly of the sort sold for stag beetles, alongside dried leaves and a calcium source such as cuttlebone. Males tend to explore in the open while females stay hidden under bark, so a mixed group gives you far more to watch.

If you are building a focused Eucorydia display, this pairs naturally with the smaller Sapphire Flower (E. yasumatsui), the easier starting point for learning the genus's ventilation balance. Both sit within our wider cockroach collection. Our animals are cautiously established from imported lines rather than a long-standing captive colony, and they travel in careful double-walled packaging with live arrival covered on UK dispatch.

Common questions

Is the Giant Flower Cockroach a good beginner roach? The husbandry itself is manageable, but the slow development and the need for strong ventilation reward some experience, so it suits keepers who have kept roaches before rather than complete newcomers.

Why are the nymphs so dull? The metallic colour only develops at the final moult, so nymphs stay brownish for months and the shift to a fully iridescent adult is the payoff for the wait.

How long until the adult colour appears? Nymph development usually takes around seven to ten months in good conditions, so treat this as a long-term display species rather than a fast-growing colony.

Kept with patience, steady airflow and a varied, pollen-friendly diet, the Giant Flower Cockroach rewards you with one of the most beetle-like transformations in the hobby.