Kasvurõngad tulenevad uuest kasvust vaskulaarses kambriumis, koore lähedal asuvas rakukihis, mida botaanikud klassifitseerivad külgmise meristeemiks, ja seda läbimõõdu kasvu nimetatakse sekundaarseks kasvuks, ning nähtavad rõngad tulenevad kasvukiiruse muutumisest aastaaegade jooksul.
Growth rings result from new growth in the vascular cambium, a layer of cells near the bark that botanists classify as a lateral meristem; this growth in diameter is known as secondary growth. Visible rings result from the change in growth speed through the seasons of the year.
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