When it comes to describing a quality plant, there are several synonyms that can be used. For instance, you could describe a plant as being healthy, robust, thriving, or vigorous. Additionally, you might consider using words like flourishing, thriving, or luxuriant to convey the idea that the plant is growing well and producing abundant foliage. Other useful synonyms for quality plants might include terms like strong, durable, resilient, or hardy, which suggest that the plant is able to withstand adverse conditions and continue to grow and thrive. Ultimately, the choice of words you use to describe a quality plant will depend on the particular characteristics and attributes you are trying to emphasize.