Leptosiphon grandiflorus (syn. Linanthus grandiflorus) is a species of flowering plant in the phlox family known by the common names large-flower linanthus and large flowered leptosiphon.

It is native to California, and grows below 1,200 metres (3,900 ft) in chaparral, coastal prairie, coastal sage scrub, closed-cone pine forest, grassland, and oak woodland habitats. It is California Department of Fish and Wildlife and IUCN listed Vulnerable species, and is on the California Native Plant Society Inventory of Rare and Endangered Plants.

Leptosiphon grandiflorus is an annual producing a hairy stem with leaves which are each divided into linear lobes up to 3 centimeters long.

The flowers are at the tip of the stem, pink or white funnel-shaped flowers with lobes up to 1.5 centimeters long. The bloom period is April to July.

Type: Hardy perennial

Hardiness zone: 3-10

Height: 18", 45cm

Location: Shade

Seeds per packet: 150