What do you call someone who always fails in growing flowers?

Gardener.

Gardeners generally refer to gardening departments or staff engaged in gardening work in some public institutions. People who generally work in flowers, fruit trees, seedlings, greening, plant maintenance, etc. are called gardeners. .

Gardener.

Everyone must have heard the name gardener often. The main job of a gardener is to prune and prune plants within a certain range and is responsible for the care of plants. Usually you can see gardeners in parks, gardens, orchards and other areas dedicated to planting plants~