What factor besides fertilizer can affect plant growth? ...
Answers: Micro nutrient content in the soild can affect growth, wet or the lack of, the density of the soil (clay verse sandy or other types), the ph of the soil, other plants/weeds, plant eating bugs or aphids or the close to, animals that eat plants or roots of your plant, (deer, moles, dogs and cats, grubs and bugs). Air tempurature, shady versus sunny, which it right for that unusual plant? Many variables.
sunlight, air heat and movement, water