This library and any plant lists generated from it reflect plants we’ve carried or could obtain over the past 12–18 months, not our current inventory or availability.
“Fire Wise” plants are not fireproof. These plants, when maintained properly, have a higher fire resistance reducing fire danger. This list is built on the recommendations of local governments and the Diablo Firesafe Council
Mammoth Grey Stripe Sunflower
Helianthus annuus 'Mammoth Grey Stripe'
Height: 10 feet
Spacing: 18 inches
Sunlight:
Hardiness Zone: (annual)
Description:
Tall and in charge, this giant variety is sure to turn some heads; reaching up to 12ft in height, and blooms measuring 10" across; these bright yellow blooms produce loads of edible seeds that are perfect for roasting; staking is required; low maintenance
Ornamental Features
Mammoth Grey Stripe Sunflower has masses of beautiful semi-double yellow daisy flowers with dark brown eyes held atop the stems from mid summer to mid fall, which are most effective when planted in groupings. Its pointy leaves remain dark green in color throughout the season.
Landscape Attributes
Mammoth Grey Stripe Sunflower is an herbaceous annual with an upright spreading habit of growth. Its medium texture blends into the garden, but can always be balanced by a couple of finer or coarser plants for an effective composition.
This is a relatively low maintenance plant, and may require the occasional pruning to look its best. It is a good choice for attracting birds, bees and squirrels to your yard. It has no significant negative characteristics.
Mammoth Grey Stripe Sunflower is recommended for the following landscape applications;
- Accent
- Mass Planting
- General Garden Use
- Container Planting
Planting & Growing
Mammoth Grey Stripe Sunflower will grow to be about 10 feet tall at maturity, with a spread of 24 inches. When grown in masses or used as a bedding plant, individual plants should be spaced approximately 18 inches apart. The flower stalks can be weak and so it may require staking in exposed sites or excessively rich soils. This fast-growing annual will normally live for one full growing season, needing replacement the following year.
This plant should only be grown in full sunlight. It does best in average to evenly moist conditions, but will not tolerate standing water. This plant is a heavy feeder that requires frequent fertilizing throughout the growing season to perform at its best. It is not particular as to soil type or pH. It is highly tolerant of urban pollution and will even thrive in inner city environments. This is a selection of a native North American species.
Mammoth Grey Stripe Sunflower is a fine choice for the garden, but it is also a good selection for planting in outdoor pots and containers. Its large size and upright habit of growth lend it for use as a solitary accent, or in a composition surrounded by smaller plants around the base and those that spill over the edges. It is even sizeable enough that it can be grown alone in a suitable container. Note that when growing plants in outdoor containers and baskets, they may require more frequent waterings than they would in the yard or garden.
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