How are the plants doing now? After the first year or so if your trees are established and growing most fruit trees will be fine growing in average soil with no additional fertilizer and extra water only during times of drought. You did not mention your planting zone or climate. A mulch on top of the soil will always help growth if you live in either a warm or cold climate. Is the strawberry in a pot or in the ground? As for all edible crops your local Master Garden clinic will be the best source of details on growing in your climate zone. Keep growing, Marianne Binetti