Ferula communis ssp. glauca is a Mediterranean native that makes a big, bodacious statement in the garden, first with its silvery-black, lacy, see-through foliage then, in the second season, the foliage extends upward to 6' tall, topped by a 3' branched, firework-like inflorescence of yellow flower balls.
Giant Fennel Care
Ferula Glauca
What is the plant
Invasive in Italy.
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Humidity
Normal
Lighting
Full Sun
Temperature
16°C - 26°C
Hardiness zone
6a - 9b
Difficulty
Medium
Hibernation
Cold Period
Toxicity
Poisonous
How to Care for the Plant
Water
Water occasionally.
Fertilizer
You can fertilize the plant every spring using a general, all-purpose mixture.
Sunlight
Best grown in full sun to part shade.
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Soil
Best grown in fertile, organically rich, continuously moist to boggy soils. // Grows in fertile, organically rich, continuously moist to boggy soils. // Perform well in most types of soil.
Temperature
Ideal temperatures should be approximately 65-75ºF + (18-24ºC +), closer to 70ºF is best.
Container
Large plants can be top heavy and should be in a sturdy pot that isn’t easily tipped.
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Additional
Fennel essential oil is extremely toxic (neurotoxic) and for this reason its ingestion is not recommended.
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