The seasonal lines (0704104000 and 0704106000) apply based on the date of entry at the US port, not the date of harvest or export. This window coincides with the period when domestic US production in winter-growing regions is active, and the duty structure is designed to reflect that competitive dynamic. Importers should plan shipment timing carefully, as an entry date falling just inside or outside the window determines which line — and potentially which duty rate — applies.

Sprouting broccoli varieties are classified under heading 0704.90 (edible brassicas NESOI) rather than 0704.10, which is reserved for headed (calabrese-type) broccoli and cauliflower. Importers bringing in broccolini, Tenderstem, or similar sprouting types should confirm classification under the appropriate 0704.90 line to avoid misclassification.