Monarda: the underrated summer queen for UK gardens

In spring, many gardens still look a little bleak: bare soil, short new shoots and hardly any colour. But if you plan wisely now, you set the scene for a summer display full of fragrance, rich tones and busy insect life. One often-overlooked perennial can take centre stage here - with a scent reminiscent of a cup of Earl Grey and flower heads that turn even the simplest border into a showpiece.

The underrated summer queen: what makes Monarda so special

This star is Monarda, often sold as Indian nettle or golden balm. It forms tidy clumps, typically reaching 70–90 cm in height, and in high summer it produces striking flower heads in bold red, pink or purple. The blooms look a little like tiny crowns or feathered head-dresses - a genuine eye-catcher, even in straightforward beds and borders.

Its fragrance is even more distinctive. If you rub the leaves, the aroma is strongly reminiscent of Earl Grey tea: citrus, mint and a gentle hint of spice. On a warm evening outdoors, it does not take long to notice how easily a breeze carries that scent across a patio.

"Monarda turns even a simple border into a fragrant summer refuge - with an aroma straight from the teapot and flowers for bees and butterflies."

Monarda usually flowers from July through to September. That makes it particularly valuable because it fills a gap when many spring and early-summer plants have already finished. For pollinators, that timing is priceless: bees, bumblebees and butterflies are drawn to it in large numbers.

Why April is the perfect month to plant

If you want the full Monarda effect in high summer, April is the moment to get started. By then the soil has begun to warm, yet it is often still pleasantly moist. That combination helps the plant put down new roots quickly and anchor itself firmly.

There is another benefit as well: plants have several months to settle in before the first real heat and dry spells arrive. As a result, they grow with more vigour, flower more freely and cope far better with short periods of drought.

The ideal spot: sun, partial shade and a trick to prevent waterlogging

Monarda thrives in a bright position. Full sun is ideal, though light partial shade works well too - for instance near tall perennials or an airy shrub. The key is soil that stays evenly fresh without becoming waterlogged.

• Light: sun to light partial shade
• Soil: humus-rich, loose, evenly moist, well drained
• Climate: hardy to around -20°C, so suitable for most UK gardens

Heavy, clay-rich ground can be more challenging because water tends to sit in it. If that is what you have, mix in plenty of coarse sand or fine gravel and work in generous amounts of compost. This creates a more open structure, giving roots access to air while still allowing rainwater to drain away properly.

How to plant Monarda correctly in a border

For a balanced look - and healthier plants - avoid planting too closely. A spacing of 40–50 cm between plants works well. It improves airflow and reduces the risk of fungal problems.

1. Loosen the soil to a spade’s depth, removing stones and old root pieces.
2. Incorporate mature compost or well-rotted farmyard manure.
3. Dig a planting hole large enough for the root ball to sit comfortably.
4. Place the Monarda at the same depth as it was in its pot, then backfill and firm gently.
5. Water thoroughly and then mulch the soil around the plant.

Suitable mulches include slightly dried grass clippings, shredded prunings, or a thin layer of bark mulch. Mulch helps the ground hold moisture for longer and suppresses some weeds.

Monarda in a pot: a scented oasis for balconies and patios

Even without a garden, you do not have to miss out. Monarda also grows well in containers, provided the pot is large enough. Aim for at least 15–20 litres - more is welcome, as it gives the roots room to develop.

In a pot, keep these points in mind:

• Make sure there are drainage holes; waterlogging is disastrous.
• Use a loose mix of quality compost-based potting soil and compost.
• Water regularly in summer, as containers heat up and dry out faster.
• Feed with a liquid fertiliser every two to three weeks, especially from May to August.

A pot of Monarda placed close to seating offers more than fragrance: its essential oils can also deter some mosquitoes - a useful side benefit on warm evenings.

Care through the year: little effort, long-lasting rewards

In the ground, Monarda is among the more straightforward perennials. Regular watering is mainly needed during prolonged dry spells, particularly in the first few years and on very light, sandy soils. Once established, it generally copes well with occasional dryness.

Key tasks at a glance:

• Summer: remove spent flower heads to encourage fresh buds.
• Autumn: once the plant has died back, cut the stems down close to the ground.
• Every few years in spring: divide the clump and replant sections elsewhere to keep the plant vigorous.

Dividing naturally creates extra plants that can be used to fill gaps in borders. If you like, you can pass divisions on to friends or neighbours - Monarda can travel quickly from one garden to the next.

Powdery mildew risk: how to keep the foliage healthy

The most common problem is powdery mildew (Oidium). In warm, humid weather a whitish coating can appear on the leaves. Affected foliage often turns yellow and looks unattractive.

"Good airflow, the right position and watering sparingly at soil level are the best ‘insurance’ against mildew on Monarda."

Preventive steps:

• Do not plant too close together; air needs to circulate between stems.
• Avoid permanently wet, heavy soils.
• Water only at the base, not over leaves and flowers.
• Cut out badly affected shoots and dispose of them in general waste.

Consistent mulching and even watering help to strengthen the plants. Robust Monarda tends to be less sensitive and recovers more quickly.

From the plant to the cup: using Monarda in the kitchen

One particularly appealing advantage of this perennial is that the leaves and flowers are edible. They bring a strong, slightly lemony-spiced flavour and are ideal for tea as well as more inventive cooking.

Popular uses include:

• Tea: pour hot water over fresh or dried leaves, much as you would with mint.
• Summer drinks: add a few leaves to cold water or lemonade and leave briefly to infuse.
• Cooking: scatter the flowers as a colourful garnish over salads or desserts.
• Syrup: simmer leaves and flowers, then combine with sugar to make a fragrant syrup.

To store some for later, dry leaves and flowers in an airy, shaded place. Kept in well-sealed jars, the aroma lasts for several months - bringing a small taste of summer into autumn and winter.

Combining Monarda well: colour contrasts and a pollinator magnet

In a mixed perennial border, Monarda looks especially effective alongside other summer bloomers. Yellow coneflower varieties, purple asters or airy white companion plants create strong contrasts and show off its unusual flower shapes.

If your priority is wildlife friendliness, plant lavender, catmint or sage around Monarda. This forms a ribbon of nectar-rich plants that stays busy all summer. At the same time, the combined scent spreads through the garden and creates a pleasantly aromatic atmosphere.

For small gardens, a narrow strip along the edge of a patio or path can be enough. Even a handful of plants will release a hint of tea and summer herbs each time you walk past.

What beginners should know

If you are growing Monarda for the first time, start with a robust variety from a specialist supplier. These are often bred for better stability and improved resistance to powdery mildew. A quick conversation at the garden centre can help you choose types that have performed well locally.

One more useful tip: Monarda shoots relatively late. In spring, the area can look empty for a long time even though the plant is there. Many gardeners accidentally dig it up because they assume nothing is growing. Marking the spot with small sticks or edging plants helps prevent that mix-up.

If you invest a little time in April in choosing the right position, improving the soil and giving the plant a good start, you will be rewarded in the months that follow with a garden that smells more intense, feels more alive and holds its colour well into autumn - thanks to a perennial that is often overlooked at first, but soon becomes hard to imagine without.