Giant Lemon is a discovery from the 1880s that rewrites what a lemon tree can be. This small, thorny citrus shrub grows 10 to 25 feet tall in warm climates (zones 9-11) and produces enormous, bumpy, thick-skinned yellow fruits that dwarf standard lemons. The flavor is distinctly sour and lemon-like, though its exact parentage remains a mystery, possibly a lemon-citron cross born from a chance seedling. North of zone 9, grow it in a container indoors and move it outside when warmth returns.
Full Sun
Moderate
9-11
300in H x 180in W
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High
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These fruits are genuinely massive, with thick, heavily textured skin that makes them instantly recognizable on any tree. The plant itself is evergreen and compact enough to manage, thriving in sandy, well-drained soil in full sun. You'll get fragrant, showy flowers followed by equally showy fruit that demands attention. Container growing makes this variety accessible even to gardeners in cooler zones who can bring it inside for winter.
The thick-skinned fruits are edible with a true sour lemon taste, making them suitable for juicing, zesting, and cooking applications where intense citrus flavor is desired. The showy fruit serves a decorative purpose in gardens and containers, adding visual interest beyond purely culinary value.
No timeline data available yet for this variety.
In zones 9-11, transplant into the garden in spring after any danger of frost has passed, spacing plants 8 to 15 feet apart to accommodate mature width. Harden off container-grown plants by gradually exposing them to outdoor conditions over 7 to 10 days before planting.
Harvest fruits when they reach full size and have turned a deep yellow color. The heavy skin should feel firm but yield slightly to pressure. Cut fruits from the tree rather than pulling to avoid damaging branches.
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“Giant Lemon was discovered in the 1880s as a chance seedling with unknown parents, possibly the result of natural crossing between lemon and citron. This accidental birth story gives the variety a certain mystique, no deliberate breeding, no controlled genetics, just a lucky seedling that proved worth keeping. The fact that its parentage remains unknown even today speaks to how little we sometimes understand about the plants that find their way into cultivation. Unlike many modern varieties, Giant Lemon arrived without a planned development story, simply as nature's surprise that gardeners decided was too good to lose.”