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You can grow perennials, shrubs and trees, even fruit trees, in large containers. But they require a soil mix that provides a long-term, steady supply of nutrients. This recipe ensures the drainage that is essential for healthy growth in containers and also provides organic soil amendments to nourish your plants.
4 parts sphagnum peat
2 parts compost (or 1 part compost and 1 part garden soil)
1 part small bark chips (composted)
1 part perlite
Mix the above ingredients, and for each cubic foot (0.03 cubic meters) of media, add these slow-release organic fertilizers:
4 ounces (110g) of dolomitic limestone
4 ounces (110g) of bonemeal
1 pound (500g) of greensand
2 ounces (55g) of bloodmeal
2 ounces (55g) of kelp meal
With this hefty dose of nutrients, your plants will not need additional fertilizing until a month after potting.
