One was planted in January 1992, the other in January 1994. Though neither tree is particularly large, both appear healthy. The area where they are planted drains well. I have not fertilized them other than with a balanced fertilizer that they get from when I fertilize the lawn. Although Santa Rosa is listed a self-fruitful variety, it usually sets more fruit if another plum that blooms at the same time is planted nearby to improve pollination.
Plums generally bloom and fruit in three to five years.
It's not unusual for yours to have not flowered yet. The ideal soil for plums is a slightly acidic, deep, sandy loam that drains well. Of these preferences, good drainage is the most important. Moisture during dry periods is important, as such weather can reduce production and weaken trees. Young plums are fertilized April through June.