Mammoth Garden Mum
Mammoth Garden Mum

Multi Buy

Size Guide
5.5
5.5" Perennial
3 or more $14.00 ea
Regularly: $14.99 ea

Mammoth Garden Mum

Scott's Nursery Ltd.

$14.99
Title

Celebrate the grand finale of the gardening year with the breathtaking, rich colour density of this traditional autumn classic. This magnificent plant naturally grows into a perfectly rounded, tight, cushion-like dome of lobed, deep olive-green foliage that smells crisp and herbal. As summer fades into autumn, this lush green mound disappears completely under a breathtaking, solid blanket of hundreds of tightly packed, symmetrical blossoms. Displaying a rich, warm palette that mirrors the changing landscape, these cheerful blooms provide an instant injection of cozy luxury, transforming front porches, walkways, and garden beds into a vibrant celebration of autumn style.
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Plant Details

Mature Size:

12-24" H x 12-24" W

Zone:

5-9

Watering:

Medium to High

Type:

Herbaceous Perennial

Growth Rate:

Fast

Light:

Full Sun

Plant Profile

Common Names:

Florist's Mum, Garden Mum, Hardy Mum, Autumn Mum, Chrysanthemum

Scientific Name:

Chrysanthemum morifolium (also known as Dendranthema x grandiflorum)

Type:

Thriller / Filler / Fall-Blooming Ornamental Perennial

Growth Details:

Mature Size: Height of 30–60 cm (12–24 inches) x Width of 30–60 cm (12–24 inches).

Growth Habit: Dense, compact, and heavily branched.

Form: Perfectly mounded, tight cushion dome.

Growth Rate: Fast; rapidly doubles in size over the summer months to prepare for autumn blooming.

Flowering: Spectacularly prolific with hundreds of button, pompon, single, or double flower heads opening simultaneously.

Flowering Time: Late summer through late autumn, often lasting until a hard freeze.

Flower Colour: Includes warm autumn tones like rich bronze, deep crimson, golden yellow, burnt orange, lavender, and crisp white.

Environmental Needs:

Exposure: Full sun (minimum of 6+ hours of direct sunlight daily).

Soil Preferences: Thrives in rich, fertile, organic, moisture-retaining loam with a neutral to slightly acidic pH (\(6.0 - 6.5\)).

Soil Tolerance: Forgiving of sandy loam or well-amended clay loam. Completely intolerant of poor, waterlogged winter soil which rots the shallow root system.

Watering: Moderate to high. Requires regular, deep watering at the base of the plant to keep the dense foliage mound happy.

Container Role: Acts as the ultimate autumnal Thriller or structural Filler in high-impact seasonal patio and porch displays.

Special Features:

Disease Resistances: Highly robust, though it benefits from open spacing to prevent foliar rust or powdery mildew during damp autumn weather.

Native Species: Derived from complex hybridization of species native to East Asia and China, where they have been celebrated for thousands of years.

Fast Growing: Quick to build a large, sturdy structural frame during the spring.

Attracts: Provides an invaluable, late-season nectar stop for butterflies, native bees, and migrating honeybees.

Uses: Festive autumn container styling, long-lasting cut flowers, front-porch displays, and seasonal mass bedding.

Resistance: Notably deer-resistant and rabbit-resistant due to the pungent, aromatic oils in the foliage.
Care Guide

Ornamental & Landscape Value

Seasonal Interest:

Bloom Information: Features immense clusters of multi-petaled flowers with exceptional showiness and a long, cold-weather shelf life.

Fall Colour: The star of the autumn show; the foliage remains a rich dark green beneath the heavy explosion of jewel-toned blossoms.

Garden Value:

Ornamental Interest: Delivers unparalleled visual impact late in the season through its perfect geometric dome form and high-density flower coverage.

Landscaping Uses: Ideal for front-border autumn accents, mass bedding displays, lining entryways, filling summer gaps, and late-season container arrangements.

Garden/Landscape Benefits: Provides high-impact, late-season colour when almost all other garden perennials have gone dormant or finished blooming.

Wildlife & Human Value:

Wildlife Value: Functions as an essential late-autumn lifeline for pollinators, buzzing with activity when few other food sources remain.

Human Value: The absolute definitive symbol of autumn home hospitality. It offers homeowners a reliable, easy, and affordable way to instantly boost front-porch curb appeal and celebrate the harvest season.

Planting & Care Guide

Planting Considerations:

Best Time To Plant: For best perennial survival, plant in early spring to give the roots a full season to establish. If planting in autumn for seasonal colour, treat as an annual.

Spacing: Space 45–60 cm (18–24 inches) apart from center to center to allow the perfect, uncrowded circular dome shape to form.

Location Tips: Choose a highly visible spot with sharp drainage. Do not plant near streetlights or bright security lights, as mums require uninterrupted dark autumn nights to trigger flower buds.

Companion Plants: Pairs beautifully with Heuchera (Coral Bells), Ornamental Peppers, Kale, Pumpkins, and late-season ornamental grasses.

Care:

Light Requirements: Requires maximum sun exposure to maintain its perfect dome shape and trigger uniform bud opening.

Moisture Requirements: Demands consistently moist, evenly damp soil; never let the root zone dry out completely, as drying causes immediate bud drop.

Maintenance: Clip off faded flowers regularly to keep the mound looking fresh. If growing as a true garden perennial, cut the entire plant back to 10 cm (4 inches) above the ground in early spring.

Fertilization: High feeder during the spring and summer growing phase. Apply a balanced, slow-release fertilizer monthly until mid-summer when flower buds begin to form.

Tolerances:

High cold and light frost tolerance, Cool autumn weather tolerant, Urban pollution tolerant, Deer and rabbit resistant

Tips For Success:

Thinning/Pinching: To achieve the signature tight, round dome shape, pinch back the top 2 cm (1 inch) of new green growth every few weeks in spring and early summer. Stop all pinching completely by mid-July so the plant can form flower buds.

Support/Staking: Completely unnecessary; the heavily branched, compact stems naturally support the massive weight of the blooms.

Mulching: Apply a 5 cm (2-inch) layer of shredded hardwood mulch or clean straw around the base to retain root moisture and insulate the shallow roots from frost.

Winter Protection: If overwintering in the garden, do not cut the dead stems back in autumn; leave them intact to protect the center crown, and mulch heavily after the ground freezes.
Fruit Profile