The Onion Conundrum: the best combinations for planting ornamental Alliums

Alliums are a great addition to a herbaceous border for many months of the year. As Piet Oudolf says “bulbs form a sort of underground army that add an extra dimension to your garden”, they can be used individually as an exclamation mark through a border or in groups creating blocks of colour. Alliums in particular have the additional bonus of not being on the squirrel, deer or rabbit menu!

Allium ‘Globemaster’ Bursting into life

Allium giganteum and A.‘Globemaster’ are real showstoppers. They have the largest heads and add great presence to a border. It is important to remember that by the time they are looking superb, their leaves beneath will look untidy and so need to be hidden. Alchemilla mollisBrunnera, and many of the Geranium family do this job perfectly.

Top tip: plant giant Alliums towards the back of a border.

Allium giganteum underplanted with Geranium. Photo credit: www.edenbrothers.com

Perfect for a white garden, Allium ‘Mount Everest’ is a tall, white Allium that benefits from a dark backdrop for example, yew hedging or evergreen topiary obelisks. I have seen these used to great effect in clumps in the new herbaceous borders at RBG Kew. Again you need to consider the unsightly leaves at the base of the plant.

Planting companions: white lavender, Dicentra (Lamprocapnos) spectabilis ‘Alba’, Astrantia ‘Superstar’, Hellebores & any of the larger white Geraniums.

RBG Kew: Allium ‘Mount Everest’ planted en masse on ‘The Broadwalk’ May 2018

The ‘Drumstick’ Allium, A. sphaerocephalon, has lovely little egg-shaped flower heads in early summer and looks great in a prairie-style planting scheme. Plant it en masse with feather grass Stipa tenuissima and Achillea ‘Terracotta’ for ultimate movement in your garden.

Prairie-style: Stipa tenuissima, Achillea ‘Terracotta’ and Allium sphaerocephalon

Finally, Allium atropurpureum usually grown for it’s rich, deep purple, star-shaped umbels matches beautifully with the dark purple stems of Salvia nemorosa ‘Caradonna’. Planted together, the pair will give a splash of colour in the front/middle of a border from late spring into summer.

Allium atropurpureum planted amongst Monarda, Amsonia & Salvia. Photo credit: www.gardeninacity.wordpress.com

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Supports & tying in!

Having suffered my usual spring bad back week, I was under strict instructions to do very little in the garden! This time of year, and the sun shinning…. Impossible! So here are my not too strenuous hints and tips to enhance and prolong flowering this year.

Plants are growing at a phenomenal rate, especially after such a cold wet spring. No sooner than I secure a plant to its support, ten minutes later it is hanging forlornly, looking dangerously fragile again!

Clematis

So often I only notice Clematis in July and August when they have collapsed and smothered other herbaceous plants, so now is the time to support. If you are growing one up a wall, try pulling the growth more on the horizontal (gently, Clematis snap very easily). A plant will always reach for the sun; so the more laterals you create the greater the display of flowers. If you have a wide obelisk try and guide the plant in a spiral growing pattern, again creating more lateral growth.

Herbaceous Clematis

These still need some support; growing them through a mesh works well, which needs to be placed just as the clematis is pushing through the soil (April).

Peonies

Renowned for their stunning large heads, these traditional cottage garden flowers benefit from support. Initially they look superb, but once a heavy May shower has drenched them that stunning display will face the ground. Place the support on the sunny side to keep foliage off plants growing underneath.

Wisteria

If you are training a new Wisteria, now is the time to keep an eye on it. New shoots are thrown out, which need tying in as soon as possible. Laterals are the key; this way you create a good skeletal structure for the racemes of flowers to hang from.

Tall herbaceous perennials

One of my Campanulas is particularly tall; another offender is Crocosmia ‘Lucifer’, which produces beautiful tropical like red flowers; but both these two can collapse on the rest of the border. There are many others, so it is worth taking photographs later in the year to help remind you whom the main culprits are.

Roses

With RHS Chelsea on the horizon I am sure many of you will be thinking of roses. Ramblers will be growing at great speed, so keep an eye on the new growth and tie these in before they snap, remember these beautiful long shoots will be next years flowers.

I find flexi tie the best for securing and tying in, it doesn’t impede the plants growth, or cut into it, and as a bonus can be used the following year!

I buy my supports from GAP, they are good value and always very helpful.