This modular modus operandi is reasonably foolproof, having the advantage that, as long as you get the main plants right, you can tweak by moving the smaller pots about, removing anything that isn’t performing quite as well as you’d hoped, and perhaps redistributing containers to draw attention to a particularly pleasing element. It allows both for serendipitous discovery, and wiggle room, and I’d be happy to recommend this way of working on these grounds alone, if it wasn’t for the fact that it’s more or less how the wonderful displays in the porch at Great Dixter are put together. And if it’s good enough for Dixter, it should really be good enough for anyone.
That said, there is another way to plant in containers – and, happily, it can be used alongside such a modular approach as I’ve become used to. The only slight fly in the ointment is that it’s a little more involved, requiring both more planning, as the planting needs to present interest over a longer period of time, as well as a good deal more commitment, there being less wiggle room once everything has been planted in the one container. I’ve seen Harriet’s plantings, both at Whichford and online, and have no doubt that this is a system I need to master in order to take my container displays to the next level. As elsewhere in the garden, there are few things more impressive than seeing an effortless scheme seemlessly transitioning from one season of interest to the next, a continual dance as one performer retreats into the wings, and another steps forward to command stage. This is succession planting in pots. Time to play with the big kids.
The first things to consider when planting any container for the cooler months is drainage. In winter it’s all too easy for the soil to become waterlogged, and no plant likes to sit with its feet in water1. To that end, make sure that whatever container you’ll be planting into has adequate drainage holes, and be sure to use a free draining compost, incorporating horticultural sand or grit – I’d be happy to use a ratio of one measure of sand to four of compost in order to make conditions a little more sharp. Add no water retaining gel or crystals – great in summer, but deathly in winter – and avoid composts to which these ingredients have been added (it should be clearly evident on the outside of the bag, probably with some daft marketing slogan “Now with ADDED Wet-Water Waffle” kind of thing).
But now comes the crunch, and, as so often seems to be the case with these things, the key would seem to be a matter of perception. Instead of viewing the container and its contents in two dimensions (front to back and side to side), we need to be mindful of four. The third dimension allows us to correctly position within the pot the bulbs which will be so important for creating interest and change in the spring – larger bulbs, like tulips, at a greater depth than smaller bulbs, such as crocuses, for example. With the introduction of a fourth dimension, time, we have to consider the display over a matter of weeks and months, as the initial winter planting gives way to the delicate freshness of early spring, and in turn the vibrancy of mid- to late-spring.
It makes for a much more crowded pot than I’m used to, but the lecture notes were full of advice as to the relative planting densities and depths for different bulbs and, as ever, Harriet’s been on hand in the online classroom to answer individual queries in person, and to discuss the other material covered this week, including colour schemes and arranging containers.
This week’s assignment asked us to create a planting plan for a pot 60cm wide by 30cm deep, providing winter interest while using bulbs to extend the season into spring. I’ve opted for a silvery grey colour scheme over winter, with white flowers, introducing pinks and blues as the weeks pass into spring.
|Planting plan of the top layer of evergreen perennials and shrubs|
The top layer features evergreen perennials and shrubs that will persist from winter through spring. Planted fairly densely, as there won’t be an awful lot of growth over the period for which this container will be on display.
|A rather ropey detail shot of Calocephalus brownii 'Silver Bush'|
|Heuchera 'Peppermint' Little Cutie Series. Image © Heucheraholics|
|Cyclamen hederifolium 'Album'|
|Senecio cineraria 'Silver Dust'|
The bulb layers next, in order of descending depth.
|Crocus 'Ladykiller'. Image © Crocus|
|Muscari armeniacum Image © Crocus|
|Fritillaria mealagris var. unicolor subvar. alba. Image © Crocus|
|Tulipa 'Flaming Springgreen'. Image © Crocus|
|Narcissus 'Fruit Cup'. Image © Crocus|
With thanks to Crocus and Heucheraholics for the use of images.
1Except maybe the swamp cypress Taxodium distichum, and even they like to leave at least their knees out of the water. You’d need a very big pot for one of those, though.
Do have a look at the My Garden School website, which is still running its Back to School campaign for 15% off all £145.00 4 week online courses in October. (Course start dates: Wednesday 7 October 2015). Click here and remember to use the code MGSBTS at the checkout for the discount.