Understanding Nepeta 'Six Hills Giant' Catmint
Nepeta 'Six Hills Giant' catmint is a celebrated herbaceous perennial valued for its vigorous growth and extended flowering season. It produces a profusion of aromatic, lavender-blue flower spikes from late spring through to autumn, making it a highly desirable plant for borders, cottage gardens, and containers. Its robust nature and drought tolerance once established also contribute to its popularity amongst gardeners seeking low-maintenance, high-impact plants that benefit wildlife.
- Key Attributes: Long flowering period, aromatic foliage, drought tolerance, attractive to bees and butterflies.
- Ideal Conditions: Full sun, well-drained soil.
- Size: Typically grows to 0.75-1 metre in height and spreads to 1 metre or more.
The plant's common name, 'catmint', refers to its appealing scent for cats, although not all felines react to it. The foliage itself is a pleasant grey-green, releasing its fragrance when brushed against. This variety, 'Six Hills Giant', is a particularly statuesque and free-flowering cultivar, distinct from smaller varieties of Nepeta faassenii. It provides a substantial drift of colour and texture throughout the summer months, acting as a dependable performer in various garden settings.
When considering this variety, it is important to note its mature size and spread. It can become quite a substantial plant, requiring adequate space to reach its full potential without overcrowding neighbours. Proper spacing ensures good air circulation, which is beneficial for plant health, and allows its generous flower plumes to be fully appreciated.
Choosing the right spot is crucial for Nepeta 'Six Hills Giant' catmint to thrive. While it tolerates a range of conditions, it performs best when planted in full sun. In shadier spots, it may become leggy and produce fewer flowers, diminishing its visual impact. The soil preference is for well-drained conditions; it dislikes waterlogged roots, especially during winter.
Consider its substantial spread when planning planting arrangements; it can easily spill over paths or overwhelm smaller companion plants if not given enough room.
Cultivating Nepeta 'Six Hills Giant' for Maximum Bloom
How do you ensure your Nepeta 'Six Hills Giant' catmint delivers the spectacular, prolonged display it's known for? Success largely hinges on providing the correct environment and basic maintenance.
Planting and Soil Preparation
Select a location that receives at least six hours of direct sunlight daily. Prepare the soil by incorporating compost or well-rotted manure to improve drainage and fertility, particularly if your soil is heavy clay. Dig a hole twice the width of the plant's root ball and to the same depth. Gently tease out any circling roots before placing the plant in the hole, ensuring the top of the root ball is level with the soil surface. Backfill with soil, firm gently, and water thoroughly. For multiple plants, space them at least 75cm to 1 metre apart to allow for their mature size.
Watering and Feeding
Once established, Nepeta 'Six Hills Giant' is remarkably drought tolerant. Water deeply during prolonged dry spells, but avoid overwatering, which can lead to root rot. A light feeding in spring with a balanced, slow-release fertiliser can encourage vigorous growth, but avoid excessive nitrogen, which can promote leafy growth at the expense of flowers. Over-fertilising is rarely necessary for this hardy plant.
Deadhead spent flower spikes promptly to encourage a second flush of blooms and maintain a tidy appearance.
Pruning and Maintenance
To prolong the flowering period, cut back the plant by about one-third to one-half after the first major flush of blooms, usually in mid-summer. This often prompts a secondary, albeit sometimes less prolific, flowering period into autumn. If the foliage becomes tatty or the plant looks overgrown, a harder prune in late winter or early spring before new growth begins is advisable to shape the plant and remove any dead or damaged stems. Removing any foliage affected by mildew is also a good preventative measure.
The benefit of a strong second bloom is undeniable, making the slight effort of deadheading worthwhile.
Exploring Alternatives to Nepeta 'Six Hills Giant'
What if Nepeta 'Six Hills Giant' catmint isn't quite right for your garden's specific needs, or you're simply looking to diversify your planting palette? Several excellent perennial plants offer similar desirable traits, such as long flowering periods, attractive foliage, drought tolerance, and pollinator appeal. Evaluating these alternatives can help you achieve a similar aesthetic or functional outcome, or even enhance your garden's biodiversity.For Extended Blue and Purple Hues
If the signature lavender-blue of catmint is what draws you, consider plants that offer a similar colour spectrum and long blooming season. Agapanthus, with its striking globe-shaped flower heads, provides a magnificent display in late summer, offering shades from pale blue to deep indigo. For earlier colour and fine texture, Veronica (Speedwell) cultivars offer spikes in blues, purples, and pinks. Salvia nemorosa varieties, such as 'Caradonna', provide vertical spikes of deep purple-blue flowers that bloom for an extended period, especially when deadheaded, and are highly attractive to bees.For Drought-Tolerant, Pollinator-Friendly Borders
Many plants thrive in sunny, dry conditions and support beneficial insects. Sedum (Stonecrop), particularly cultivars like 'Autumn Joy', offers sturdy succulents that provide late-season interest with pinkish-red flower heads that age to russet. Echinacea (Coneflower) varieties, with their daisy-like flowers and prominent cones, are a magnet for butterflies and are very drought tolerant once established. Their medicinal and ornamental qualities make them a versatile choice. For a different texture, consider flowering **Heuchera** varieties that bloom with airy spires above their foliage, which itself comes in a vast array of colours.For Similar Size and Structure
If you're looking for a plant that fills a similar space in the border, consider alternatives that grow to a comparable height and spread. Tall varieties of **Peonies** offer abundant, often fragrant blooms in late spring to early summer, with lush foliage that provides structure for the rest of the season. **Foxglove** (Digitalis) provides dramatic verticality with its spires of bell-shaped flowers, though typically it is a biennial or short-lived perennial. For a more woodland-edge feel, large-flowered **Hellebores** can provide early colour and elegant, nodding blooms, some of which tolerate drier conditions once established. While often grown for their foliage, varieties of **Chrysanthemum** can offer late-season colour and a substantial presence, though many require more regular watering than catmint.Companion Planting Considerations
When choosing companions for catmint or its alternatives, think about plants that tolerate similar conditions. Drought-tolerant beauties like ornamental **grasses**, robust **Heuchera** for foliage contrast, or sturdy **Dahlias** (if well-watered) can create dynamic planting schemes. Even robust **Delphinium** varieties, if given adequate moisture and support, can add a taller, more dramatic element to a sunny border. The goal is to select plants that complement the colour, texture, and growth habits of your primary feature plant.The key to a thriving, low-maintenance garden is selecting plants with complementary needs and growth patterns.
Observe your garden's microclimates; a spot that seems sunny might have hidden dry pockets, making drought-tolerant choices even more critical.