How to Grow Ten Weeks Stock Mammoth
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Ten Weeks Stock Mammoth
Matthiola incana
flowerTen Weeks Stock Mammoth is a classic ornamental flowering plant prized for its tall spikes of densely packed, fragrant blooms in shades of pink, purple, red, white, and lavender. Known for its rapid growth and abundant flowering, it typically blooms within 10 weeks of sowing, making it ideal for quick garden color and cut flowers. The Mammoth variety is a large-flowered, double-blooming selection that produces particularly showy flower spikes.
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Example Ten Weeks Stock Mammoth timeline · Pittsburgh, PA (Zone 6b)
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Plant Ten Weeks Stock Mammoth
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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First Ten Weeks Stock Mammoth blooms
Around Jun 16≈ 60 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Ten Weeks Stock Mammoth dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 2-10 as a cool-season annual; best flowering in zones 2-8 with cooler spring temperatures
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Get my Ten Weeks Stock Mammoth timeline →Growth Stages
Germination & Seedling
2-3 weeksSeeds sprout in 7-14 days at 60-70°F. Cotyledons emerge followed by true leaves. Seedlings are delicate and small.
Keep soil moist but not soggy; provide bright light and cool temperatures; thin to proper spacing to prevent damping off. Avoid high humidity and poor air circulation.
Vegetative Growth
3-4 weeksPlant develops a dense rosette of lance-shaped, blue-green foliage with sturdy stems elongating upward. Roots establish and plants gain vigor.
Maintain consistent moisture; apply balanced fertilizer every 2 weeks; ensure good air circulation. Pinch growing tips when 6 inches tall to encourage branching (optional).
Flower Bud Formation & Budding
2-3 weeksA central flower spike forms at the stem apex with dense clusters of tiny flower buds tightly packed along the spike. Multiple side spikes may also develop.
Continue regular watering and fertilizing; reduce nitrogen slightly in favor of phosphorus to promote flowering. Keep temperatures cool for best bud development.
Flowering
4-8 weeksBuds open progressively from bottom to top along the spike, revealing large double flowers in full color. Mammoth varieties produce particularly full, multi-petaled blooms on long, sturdy stems.
Water consistently; deadhead spent flowers to encourage continued blooming and prevent self-seeding. Apply low-nitrogen fertilizer to extend flowering. Cool nights prolong bloom period.
Seed Set & Decline
2-3 weeksAfter pollination, flowers fade and pods form. In hot weather or as photoperiod lengthens, flowering slows and plants may decline.
Remove dead flowers to prevent seed set if prolonging bloom is desired. In regions with hot summers, plan succession plantings for continuous color. Let some flowers set seed to collect for next season if desired.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Use row covers on young plants; handpick caterpillars; apply Bacillus thuringiensis (Bt) if infestation occurs
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Apply neem oil or insecticidal soap; use reflective mulch; encourage natural predators
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Spray with strong water jet; apply insecticidal soap or neem oil; encourage ladybugs and parasitic wasps
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Improve air circulation; avoid overhead watering; apply sulfur dust or neem oil at first sign of white coating on leaves
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Ensure well-draining soil; avoid overwatering; remove and destroy infected plants; apply fungicide if soil-borne disease suspected
Uses
Edible Flowers
CulinaryStock flowers are edible and can garnish salads, desserts, and cocktails, offering a mild, slightly sweet flavor with a delicate texture. [source]
Cut Flowers & Arrangements
HouseholdTall, densely flowered spikes make Stock ideal for cutting gardens, floral arrangements, and wedding bouquets. Flowers last 1-2 weeks in a vase with proper care. [source]
Fragrance
HouseholdStock flowers emit a sweet, clove-like fragrance that intensifies in cool, moist conditions. Popular in Victorian gardens for their perfume. [source]
Pollinator Support
WildlifeStock flowers attract bees, butterflies, and other pollinators, providing valuable nectar and pollen sources, especially in spring when other flowers are scarce. [source]
Dried Flowers
CraftStock flowers dry well and retain color, making them suitable for dried arrangements, pressed flowers, and craft projects. [source]
Harvest Tips
Cut flower spikes in early morning when buds on lower portion are open but upper buds still closed for longest vase life (7-14 days). Use a sharp knife to cut stems at an angle. Remove lower foliage below waterline. Re-cut stems every 2-3 days and change water frequently. Pinching off side shoots and deadheading encourages more blooms on garden plants.
Fun Facts
- 🌱 The 'Ten Weeks' name refers to the remarkably fast time from seed to bloom—typically 60-80 days—making it one of the quickest-flowering ornamental plants available.
- 🌱 Stock flowers were beloved in Victorian gardens and are featured in numerous historical garden paintings and texts; they remain popular in cutting gardens today.
- 🌱 The Mammoth variety can produce flower spikes 12-24 inches long densely packed with blooms, and some flowers are double-flowered (with extra petals), making them exceptionally showy compared to wild single-flowered forms.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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