Ecology for Planting Design - understanding long-term plant performance. (C) Noel Kingsbury 2016
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1 Ecology for Planting Design - understanding long-term plant performance (C) Noel Kingsbury 2016
2 Understanding plants as living materials Inherently less predictable than hard materials Need to understand, and predict long-term performance Few reference materials on long-term performance Need for practitioners to be able to make own predictions based on reading the plant Rabbit s Eye View - basic observation Need to be able to communicate observation skills
3 Themes Plant survival strategies and what this means for plant selection for gardeners Long-term plant performance: what this means and how gardeners can predict it 34
4
5
6 THINKING ECOLOGICALLY ABOUT ORNAMENTAL PLANTS Involves thinking about: The conditions in which they grow best - which is not necessarily the same as that in which they grow in their wild habitat... often the plant in the wild is growing in the worst conditions it can tolerate. How the planting will develop How plants will compete with each other over time
7 The CSR model of plant survival strategies Competitors - high resource environments Stress tolerators -low resource environments Pioneers (ruderals) - short-lived opportunists
8
9 C - competitors have a high level of dominance highly mobile dominate fertile sites, as they can make maximum use of high levels of resources BUT are liable to reduce the level of diversity
10 Nitrogen response Growth Urtica - strong competitor Achillea - moderate competitor Scabiosa - weak competitor Nitrogen
11 In fertile, resource rich environments, the winner takes all Fertility Species diversity In poor environments, no one plant can monopolise resources
12 Competitors tend to : have large, lush, soft leaves be rapid growing be tall have means by which they reproduce vegetatively: - runners, rapidly growing rhizomes etc.
13 Competitors - their problems: rapid, even aggressive growth creates a variety of problems: large quantity of material to remove at end of season competition between species reducing diversity and hence visual effect
14 S- Stress tolerators Are adapted to flourish in low-resource environments low nutrient (poor, shallow, sandy etc, soil) drought shade other problems which reduce ability to absorb nutrients such as waterlogging
15 Stress tolerators Conserve resources, so are likely to be: evergreen - physically tough foliage slow-growing, often woody, or with storage organs such as bulbs.
16 CHOOSING AND WORKING WITH STRESS-TOLERANT PLANTS Can be paradoxically easier than with competitors: - they are slow-growing, and so management and inter-species competition are both reduced But Selection does need to be precisely matched to habitat to avoid losses
17 Stressful situations 1 drought (sun and wind) sub-shrubs - evergreen - grey/silver foliage - dense, twiggy growth grasses with tough tussocky growth! (cespitose grasses)
18 Sub-shrubs Low, ground-hugging habit Only weakly woody Dense mass of branches - fine twiggy growth Often found in habitats where drought possible
19 Cespitose grasses Very tight hummocks Leaves radiating up and out from base Tend to get to a certain size then not increase Mostly from stressful environments Recycle nutrients from dead leaves Growth habit attractive
20 The grass gradient Cespitose Clump or mat-forming Turf grasses
21 Stressful situations 2 shade - many evergreen perennials - glossy dark green foliage - ground-covering habit common - early (or late) growing geophytes - slow-growing design note - overwhelmingly spring flowering
22 Stress avoidance competitive species which simply become dormant during stressful conditions (mainly drought):... summer-dormant perennials including geophytes (bulbs, tubers)
23 Weeds in stressful environments - tend not to grow well - in shade are easily smothered with ground-cover species - in drought-prone sites can be kept in check with low evergreen shrubs - but where growth is sparse, may be a problem - hence gravel mulching
24 R- Ruderals (Pioneers) short-lived plants: - annuals - biennials - short-lived perennials
25
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27 Ruderals (pioneer species) live fast, die young species survive through seed production, long-term survival of seed in soil seed bank seed germinates when soil is disturbed pioneer species occupying bare ground
28 Pioneers very useful for spontaneity in gardens colour good structure useful for combining with long-lived perennials for temporary effect (1st year)
29 Short-lived perennials difficult to know exact life span nearly always set plenty of seed often very ornamental lack of rooting side-shoots (ramets)
30 Vegetative spread in herbaceous perennials
31 Vegetative spread in herbaceous perennials ramets = potentially independent plants species without clear ramets either short-lived or vulnerable to damage gradient between species with wellintegrated ramets and less wellintegrated ramet
32 Short-lived perennials (non-clonal) Potentially long-lived perennials (clonal) Long-lived but slow to establish perennials (clonal)
33 Short-lived perennials (non-clonal) Potentially long-lived perennials (clonal) Long-lived but slow to establish perennials (clonal)
34 Cerinthe major
35 35
36 Short-lived perennials (non-clonal) Potentially long-lived perennials (clonal) Long-lived but slow to establish perennials (clonal)
37 Vegetative spread of clonal perennials rate of increase - number of shoots per year length of spread - per year how persistent are they?
38 Helianthus Lemon Queen
39
40 Patterns of spread
41 41
42 42
43 43
44 Geranium endressii
45 Rudbeckia fulgida
46 Rudbeckia fulgida
47 Lysimachia punctata
48 Short-lived perennials (non-clonal) Potentially long-lived perennials (clonal) Long-lived but slow to establish perennials (clonal)
49 Its all underground - slower to develop long-term competitors Investment in roots It may take a long time to see results Long-term domination of the environment led by the root system
50 Regenerative strategies in woody plants Trees Shrubs Both trees and shrubs may sucker or regenerate from the base Some shrubs do not regenerate from the base - short-lived or vulnerable to damage
51 Vegetative spread in herbaceous woody plants
52 links/research page
53 Sub-shrubs Low, ground-hugging habit Only weakly woody Dense mass of branches - fine twiggy growth Often found in habitats where drought possible
54 links/research page
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