Q How can I grow tree seedlings under my acer?
A MATT SAYS Water the pot so the compost is moist, then gently ease out the seedlings with a hand fork, doing as little damage to the root as possible. Tease the seedlings apart, sprinkle mycorrhizal fungi on the roots to stimulate root growth, then transplant into individual pots that are slightly larger than the spread of the roots and filled with peatfree ericaceous compost. Pot them at the same level as they were before, then firm the compost, leaving a gap between the surface of the soil and the rim of each pot for easy watering. Label the seedlings clearly and put them in a sheltered, shady spot. Keep the compost moist and check the pots regularly through the growing season. If roots appear through the hole in the bottom, repot into a container one size larger. Keep doing this until a good root system is established.