For the arugula genus, plants generally prefer full sun to partial shade, and moist, well-drained soil with a pH range of 6.0-7.5. To plant arugula, prepare the area with compost or organic material, and sow seeds directly at a depth of 1/4 inch. Space plants approximately 6 inches apart. Water thoroughly after planting and regularly thereafter. As growth varies across species, researching specific needs of your arugula plant is advisable. Regularly check for pests and diseases and treat accordingly.