Growth of a plant structure from the time of its initiation by an apical meristem until its expansion is completed.
Source:ISBN:0471245208
Comment
Has its inception in the apical meristems (PO:0020144) and continues in their derivative meristems - protoderm (PO:0006210) and procambium (PO:0025275) - even in older tissues. Primary and secondary growth can occur simultaneously in the same organism.