Gardening Magazine

The Tropical Border – 3rd Year

By David Marsden @anxiousgardener

Mid September already?

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It seems just a few short weeks since I lugged a large Musa basjoo out of a greenhouse;

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since I stripped the straw protection off those I’d left outside.

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Only a little while since I wheeled out Colocasia esculenta

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and hefty red bananas (Ensete maurelii).

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Hardly any time at all since I manhandled this particular fellow into position.  Well, two of us manhandled.

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April 2014

But all that was months ago – way, way back in April.  Spring was very mild this year and I gambled on getting the tropical border under way earlier than usual.  (Frosts are common at the Priory during April and even into early May).

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May 2014

The gamble paid off – we had no late, hard frosts and by the end of May, daylilies, cannas and dahlias were pushing through a thick, compost mulch.  A mulch which I had generously scattered with pelleted chicken manure.

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By early June, spider daylilies were blooming, including ‘Stoplight’.

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But overall the bed was still fairly sparse.  Tropical borders are late starters.

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A month later and it had plumped up a bit.

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Lilium pardalinum looked splendid.

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They flower for several weeks, look rather exotic and so sit well in this border.  I like them a lot … but not enough.  I shall remove them in the autumn.  As pretty as they are, they’re a martyr to lily beetle.  However many red beetles and ghastly grubs I picked off, later on they became infested; tatty, yellowed and horrid.  Some plants simply don’t make the grade.   But then this a learning curve for me; I find out what works by experimentation.  Sometimes disappointing experimentation.

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Unlike the lilies, Dahlia ‘Smarty’ most certainly does work and has earned itself a regular centre-stage spot. The biggest, this one, was left in the ground over-winter, heavily mulched.  All the dahlias left in the ground performed better than those I lifted, stored and replanted.

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‘Smarty’ produces a staggering amount of flower – each one different.  It is a reliable, non-stop stalwart, thuggishly shouldering to the fore.

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Mid July and another star performer has entered the fray – Dahlia ‘Bishop of Llandaff’.

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Regular dead-heading should ensure flowering through to the first frost.

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With two dahlias performing so very well, I’m hoping for a third.  I’ve added another to the mix – D. ‘Twyning’s After Eight’.  Though still small they’ll make a bigger impact in 2015.  Incidentally, I only grow single dahlia varieties.  I do like some of the ball and cactus forms but bees and butterflies don’t.

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Also by July, and at long last, my bête noire – those satellite dishes – were obscured, if only partially.  Thank you tropical border.  Thank you so very much indeed.

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Arundo donax centre, rear

Early August and Canna ‘Red King Humbert’ and red bananas add height and dark foliage.  Arundo donax – the Spanish reed – adds yet more height, but produced fewer canes than I wished for.  I have two of the variegated form (Arundo donax ‘Variegata’) – though you can’t see them.  They are at the back and only a couple of feet tall.   I can dream that they’ll tower next year.

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Canna coccinea is a brilliant plant.  Hardy, handsome and stout enough to stand without support (which is all any one of us can hope for).  I have one big clump and it really should be spilt.  But I’ll struggle to find space for the new plants.  I only have so much room. 

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I will however always find space for Salvia uliginosa.  If you don’t grow it, please explain why.  You really should.  I adore it.  Though hardly exotic, it flowers for months, doesn’t need dead-heading and grows to six or seven feet.  Did I mention that I adore it?  Even if it does need staking.

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Bees love it too.  But it isn’t necessarily hardy, at least at the Priory.  I lift and store mine in the cold frame.  I feed and water prodigiously but I’ve read online that it is happy in a dry garden.  Which considering its common name, bog sage, I find surprising.  Most sources suggest propagation by cuttings but I find the easiest way is simply to divide the root ball.

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Tetrapanax papyrifer ‘Rex’ foreground

There are some big foliage plants in the border:  Tetrapanax papyrifer ‘Rex’ is putting out bigger leaves each year.  I like ‘Rex’ but it does sucker like crazy.  In a confined space this can be annoying although you’ll have plenty of presents for friends.  It does fine in pots and is hardy enough to leave out over winter.

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There are also two Melianthus major plants here – though you can’t see them.  They are toward the back and completely swamped.   I’ll pull them forward next year.  And the colocasias haven’t made much of a statement either – they too are towards the rear.  I’ll need to re-tinker the planting – as I do every year.

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There is no denying that a tropical/exotic border is a lot of work.  Large, non-hardy plants must be planted out in spring and dug up again at the end of the season.  Dahlias will flower dementedly – if you deadhead.  Enormous Amazonian leaves will unfurl – if you feed.  The border will look lush – if you water.  But I’ve had it with hour upon hour of watering.  Next year, I shall criss-cross soaker-hose throughout the bed.  Such an obvious solution – and a little worrying that it hadn’t occurred to me before.

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Colocasia esculenta peeping out, right

Hurricane Bertha proved that some of my staking was inadequate.  My friend Jill (who tended the gardens whilst I was away in Germany) had to single-handedly hoist huge, flattened plants back upright and lash them to posts.  She did a marvellous, heroic job.  Thanks Jill.

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The border last week. Battered and banana leaves ripped by the storm, it’s just about hanging on

If you want to grab a visitor’s attention; if you wish to be enthralled by enormous jungle plants; if you long for lush green and outrageous color for several months, then do try a tropical/exotic border.  I can’t think of any other part of the gardens that gives me quite so much pleasure.

Roll on Year 4.


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