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Cristina is a garden writer and instructor who specializes in the importance of soil in gardening. Cristina has been instructing adults for over 30 years. Cristina also writes Soil Groundwork blog and runs a tweet chat called #groundchat, which discusses different soil-related topics on Twitter every Friday at 2 pm EST. She is a longtime gardener (30+ years) with two degrees in horticulture. Her Masters covered aspects of soil and plant nutrition. Cristina has gardened in many types of soils. From sandy soil at 10 years old to clay soil garden in southern Ontario.