Nancy Jane?s stacking planters 12 in. now can be stacked up to 6 layers high with our new 6-pack Set. Nancy Jane?s Stacking Planters are a new concept in plant pot technology. Stacking Planters are specifically designed in such a manner that when stacked they produce a column of multiple growing facets. Nancy Jane?s Stacking Planters allow the grower to create outstanding floral displays.