Ideally, if you are starting a new garden area, amend all the soil in the area before you plant anything. Try to avoid using commercial fertilizers on plants the first year after you plant them. Most commercial fertilizers have a high salt content, which easily can burn the roots of the plants. Being transplanted is a big shock on a plant and it may not have a lot of reserves to deal with other sources of stress, such as fertilizer salts. If the plant is not doing well and needs additional nourishment use organic fertilizers and compost.
Organic fertilizers are less likely to burn the roots of the plant.
That's all for now.