Is your trees in the ground or in containers? If in the ground C35 is well adapted to loam, sandy loam and sandy soil. Performs poorly in very heavy soils with poor drainage. C35 has good compatibility with all oranges, all grapefruit and Lisbon lemon, but is incompatible with Eureka lemon. Mandarins on C35 preform well for at leas 10 to 15 years, but many eventually develop bud union crease and decline.