Some flower cat trees may suit large cats, but suitability depends on the individual product's dimensions and documented limits. The outer diameter of the flower is not necessarily the size of the area that supports a resting cat.
Petals can project beyond the centre or slope upwards, leaving a smaller usable bed. Ask for the centre dimensions and inspect an overhead photograph if possible. Also examine the route to the flower perch, the width of intermediate platforms and how the top section attaches to the support. A large cat needs room to settle and turn, not merely enough space to balance while sitting. Check the required anchoring and assembly instructions as carefully as you would for a plain tower. Choose a decorative design because it meets those practical needs as well as the look you enjoy.
For instance, a 60 cm flower with a 35 cm supporting centre is a 35 cm resting platform, not a 60 cm one. These are example dimensions, but they show why the outer silhouette can be misleading.
For product comparisons alongside this advice, see Floral Canopy and Arbor Retreat. The details below explain their sizes and uses.
Further reading: cats.org.uk; cats.org.uk.
Floral Canopy
Arbor Retreat
Linden wooden cat tower