I am a biodynamic farmer on a medium size commercial organic farm. We use the biodynamic planting calendar for seeding crops in the
greenhouse and on transplant days. However we use it with a degree of practicality. Obviously as a commercial farmer we have specific target planting dates we try to follow.
***The rule of thumb that we follow on our farm is that we can seed anything on a ROOT day, because we want to encourage all our plants to have excellent roots. However we try to avoid FRUIT days with LEAF/STEM plantings, vice versa. Example, we would not seed a lettuce planting on a FRUIT or FLOWER day, because we do not want to encourage blotting. Root days can be your most versatile planting day.