As I'm potting F2 Citrange winter survivors I'm noticing an interesting phenomenon. Due to the large number that were hand planted (20,000 - 21,000) plants, they were planted 4 per hole. Even so, planting took 40 hours to complete.
I've noticed some of the hardy plants have one or more of the companion plants beginning to grow from a low point on the stem. As I attempt to separate them, some are joined by self-grafted roots. It appears the hardy plant has slightly increased the hardiness of the joined companion plant. The stem of the recipient plant has only slightly increased stem hardiness. The effect is noticeable very low on the stem, just above the roots. It appears planting them individually would have prevented this, however 40 hours of hand planting was near my endurance limit.