What are plants called that do not respond to changes in light cycles for flowering?

The correct categorization of plants that do not respond to changes in light cycles for flowering is indeed day-neutral plants. These plants can flower regardless of the lengths of day or night. They have adapted to bloom based on other environmental factors such as temperature, water availability, or the age of the plant, rather than the photoperiod.

Plants are typically classified into different categories based on their light response: long-day plants require longer daylight periods to flower, while short-day plants flower when days are shorter. Circadian plants is not a recognized term in botany related to flowering responses, thus does not apply here. It's important to differentiate day-neutral plants from those that are sensitive to day length, as this affects growth and reproduction strategies in various environments.