- Name: Red Lupine 'My Castle' - Other Common Names: Red Castle Lupine / Red Russell Lupine - Scientific Name: Lupinus Polyphyllus 'My Castle' / Lupin - Color: Scarlet Red - Plant Seeds: Outdoors After Danger Of Frost / Indoors Weeks Before Last Frost - Bloom Time: Mid Spring - Early Summer - Hardiness Zone: 3 - 9 - Plant Height: 32 - 40" - Plant Spacing: 18 - 24" - Light Requirements: Sun - Soil & Water Preferences: Average - Quantity: 25 Seeds - Other: Parts Of Lupine Plants & Their Seeds Can Be Toxic To Humans & Animals. Do Not Ingest.