4.1. Science, Research, Horticulture, Education, and Conservation
Scientific and formal educational activities remain a key mandate at many botanic gardens [
52]. For BGCI, the conduct of science remains a defining trait for the recognition of botanic garden institutional status. Within this framework, scientific botany has retained its historical importance as science departments continue to study plant structure and physiology, distribution and classification. However, whereas medicinal, economic, and ethno-botany were a central activities at earlier botanic gardens, contemporary botanical research tends to prioritize matters of environmental sustainability. This includes research on plant genetics, propagation, ecosystem dynamics, plant diversity, biodiversity conservation, and adaptation to the planet’s changing climate.
The development of novel methods and technologies for the study of plants and plant ecology has also impacted the ways in which plant science is carried out at botanic gardens. The study of plant ecology and reproduction accelerated exponentially in recent decades with the development of theoretical modelling. These innovations allowed scientists to explore multi-scale interactions over time among plant genetics, ecology, pollination, and reproductive system evolution. They “paved the way for a large number of experimental studies in the laboratory and field, merging pollination biology, quantitative genetics, comparative biology, phylogenetics, population genetics and, most recently, genomics”[
53] (p. 999) .
The adoption of new scientific methods and technologies at botanic gardens (such as advances in DNA techniques), has enhanced their potential contribution to the mitigation of climate change. For instance, DNA research can identify the role that specific genes may play in rendering plants better adapted to withstand drought and hotter climates. These studies have the potential to support the alteration of plant genetic material toward greater resiliency in a world where average temperatures are expected to continue to increase. While these developments could be of great importance for the future sustainability of agriculture, these research activities also carry the potential for significant economic impact — especially for the nations leading such research.
When it comes to plant DNA material, some botanic gardens host invaluable collections not only in the form of living plants, but also stored in herbaria. These archives contain samples of plants that are currently threatened or even extinct, but which still harbour genetic material that could eventually be of use. A large number of the herbaria that were produced in the past 400 years are stored at botanic gardens in the global north. The use of genetic material stored in herbaria raises questions about the politics of the colonial frameworks within which they were collected. The content that now rests in herbaria was often extracted via inequitable colonial relations that favoured the interests of colonial rulers in unequal systems of exchange and/or forceful extraction. At a juncture where decolonization is increasingly recognized as an important socio-political issue, the question becomes- who gets to make decisions about, and benefit from, the use of herbaria in contemporary science, as well as who stands to gain from its applications and how.
As institutions of cutting edge research, some botanic gardens are accredited centres of teaching and learning from entry levels all the way to the highest levels of graduate study. A large majority of botanic gardens provide educational programs for lay audiences that include both children and adult learners [
54]. These programs cover a very wide range of learning possibilities, from teaching children the basics of plant seeding and growing, to teaching adults how to combine the pursuit of ornamental aesthetics, food security, and biodiversity. As accredited institutions of formal training and teaching, botanic gardens also offer a wide portfolio of learning possibilities at undergraduate, graduate, and post-graduate levels. This is particularly true of botanic gardens that are associated with universities.
In the past, scientific knowledge practices at botanic gardens were favoured over informal lay knowledge practices — often referred to as traditional ecological knowledge [
55]. The latter was often dismissed as not relevant, or rendered invisible beyond the archives into which they were collected. This is ironic if one considers that a great deal of what is now recognized as scientific knowledge within the history of botanic gardens was developed with the help of local inhabitants in colonial territories. In recent years, however, the value of the kinds of lay expertise have been recognized as crucial in the support of contemporary biodiversity conservation [
56]. Scholars have shown that cultural diversity is intimately associated with the preservation of biological diversity. While there is still great need to widen awareness of these associations, the complementarity of lay and scientific expertise is increasingly recognized as a vital aspect of global biodiversity conservation — including at botanic gardens.
Alongside these developments, horticultural activities have retained their prominence at botanic gardens. This constitutes no surprise. The practice of cultivating and tending to plants, has been a central feature of the botanical garden institution since its inception. To this day, ornamental displays attract a large percentage of people who visit these gardens. They are a key source of revenue at botanic gardens, and one of the major drivers in the continuing expansion of the garden tourism industry. The instrumental role that horticulture plays in relation to science endeavours at these institutions, however, is far less visible to the average visitor despite the existence of interpretation materials that highlight these contributions.
To be sure, scientific investigation and horticulture continue to go hand in hand at many botanic gardens. It can be said that horticulture is the applied dimension of plant science [
57]. This role is exceedingly important in the context of biodiversity conservation and climate change mitigation and adaptation. Experts trained in horticulture are often tasked with the challenge of finding ways to reproduce and propagate plants that have not yet undergone processes of ‘domestication’. This is highly important work in cases where specific plant species are nearing extinction, as well as in the context of ecological restoration projects. Horticulturists also possess the necessary expertise to work on the strategic reproduction of specific plants with the goal of selecting traits that render these plants more resilient to specific contextual alterations, and therefore more adaptable to changes in climate and/or ecosystem dynamics.
As an extension of all of these activities, botanical garden biodiversity conservation materializes in two main forms. They are in situ conservation and ex situ conservation. Translated from Latin, in situ means ‘in place’. It refers to conservation done within ecosystems with the goal of preserving and/or restoring plants in the endemic settings from which they evolved [
58]. Ex situ refers to the conservation of plants outside their original ecosystems. More often than not, this refers to the plant collections that are held at botanic gardens. Many are plants extracted and collected from a variety of locations around the world. Typically this is the case of botanic gardens situated in nations that were former colonizers as described earlier in this article.
In situ and ex situ conservation practices are often mutually supportive [
59]. It is not uncommon for botanic gardens to rely on plant collections that they host ex situ for the reproduction of specimens that go into restoration initiatives in situ. It is important to note that this can entail plant species that are considered all but extinct with only a few specimens remaining in existence ex situ [
60]. This reality has led to new and exciting collaborations among botanic gardens in the global north and botanic gardens in the global south [
61]. Highly important — and successful — biodiversity conservation and restoration initiatives have taken place in this context [
62,
63]. Nevertheless, questions can emerge about the potential for power imbalances to develop between botanic gardens which inadvertently reproduce dynamics that echo those that characterized former colonial relations [
64]. For example, collaborations between gardens could entail the extraction and centralized storage of knowledge practices in inequitable fashion. Gardens operating within a decolonial framework are particularly attentive to such possibilities and engage reflexively in means to avoid their occurrence [
65]. KEW gardens has pioneered the digitization of its archives and collections as a strategy to making these resources more widely accessible and therefore rendering knowledge sharing practices more equitable.
4.2. Social Engagement and SDGs
At the dawn of the new millennium, botanic gardens began to expand their approaches to plant biodiversity to also include engagement with socio-cultural issues pertaining to environmental sustainability [
66,
67,
68,
69,
70,
71]. A 2010 landmark report commissioned by BGCI, the Leicester study [
72,
73], was a turning point in this context. It identified possibilities for new forms of botanical garden engagement with general audiences, and how these goals might be achieved [
74]. The report’s core focus was the UK, but many of its conclusions are applicable to a vast array of botanic gardens beyond Europe and the global north.
The study drew attention to untapped potential at botanic gardens. It suggested that botanic gardens could play more prominent roles in educating general audiences on the importance of preserving plant biodiversity, in reconnecting people to plant worlds, and in providing greater insight into how citizens might themselves contribute to plant preservation [
75,
76]. The study recommended that botanic gardens achieve these objectives by working “in partnership with their local communities and addressing contemporary concerns like climate change” (Towards a New Social Purpose: 2). Moreover, the study indicated that botanic gardens could facilitate the materialization of key goals in the Global Strategy for Plant Conservation (GSPC) by collaborating with communities of lay experts beyond the walls of the botanical garden. At the time of the study, many botanic gardens had amply demonstrated their capacity to tackle aspects of the GSPC that require scientific expertise in plants and plant ecology. One of the chief outcomes of the Leicester study was to show that botanic gardens could
also make crucial contributions to GSPC mandates that require attention to socio-cultural dimensions of biodiversity conservation.
One of the additional contributions of the Leicester study was to unveil challenges that confronted botanic gardens in the UK and most likely shared by many of the classic botanic gardens in Europe. The main problem revolved around audience perceptions of historical botanic gardens as inward looking, elitist institutions that implicitly reflected the sensitivities of ‘white, middle class, older’ visitors. The presentation of plant nomenclature in Latin and the communication of science in technical language were examples of practices that sustained the image of botanic gardens as unwelcoming to visitors from distinct backgrounds and with distinct motivations. The recommendation that came out of the Leicester study was that botanic gardens ought to strive to become more socially inclusive and equitable and rethink their core missions accordingly.
It is important to note that given its UK focus, the Leicester study was not mandated to explore and account for botanic gardens beyond the European context. As such, it does not include botanic gardens that have — from their inception — been dedicated to carrying out socio-cultural ecological missions. In the global north, the Montreal Botanical Gardens in Canada, founded in 1933, is an early example of this trend. In turn, a large percentage of the botanic gardens that were inaugurated throughout the global south between 1992 and 2023 and dedicated to biodiversity conservation seem to include social roles at their core [
77]. The latter is in fact captured in BGCI publications that provide detailed accounts of the richness and variety of projects in existence globally. These botanic gardens carry out critically important work in pursuit of socio-environmental sustainability. Arguably, this helps explain the more general resiliency of the botanic gardens in the 21st century and their proliferation in the global south.
The Leicester report was unambiguous in its position that the future survival of the botanic garden institution might very well depend on its ability to remain socially relevant in the context of growing concerns with our planet’s environmental status and related matters of global inequity. Alas, the report also acknowledges that the capacity to do so varies greatly among different botanic gardens along the lines of financial resources, institutional willingness and/or know-how and location. This is a highly consequential state of affairs, especially for botanic gardens that face difficulties in transforming themselves to adapt to new historical demands — whether it is due to lack of resources, or to internal divisions within botanic gardens concerning the conceptualization of the institution’s future.
In response to the Leicester findings, and noting that the conservation of plant diversity “is intrinsically linked to global issues including poverty, human well-being and climate change” [
78] (page 2), BGCI invited botanic gardens to re-imagine their philosophies, missions, and practices accordingly. Success in obtaining a grant from the Calouste Gulbenkian Foundation, added momentum to BGCI’s efforts in this context. It provided the financial resources for BGCI to launch an initiative that sponsored 6 pilot projects at botanic gardens in the UK (
https://www.bgci.org/our-work/projects-and-case-studies/communities-in-nature-growing-the-social-role-of-botanic-gardens/). These experimental projects were to be assessed as a baseline for expanding botanical garden social engagement on a much larger scale through BGCI’s global network. Titled “Communities in Nature” the pilot program ran from 2010 to 2015 and was highly successful. It demonstrated that botanic gardens can
de facto develop and implement activity programs that engage communities meaningfully and productively to achieve goals that simultaneously serve social and environmental purposes [
79]. Building partly on the project’s success and lessons learned, BGCI was indeed able to scale up the approach to a global level and it “resulted in this approach being embraced as a foundation to all of BGCI’s public engagement work” (same link).
Between the global expansion of the number of botanic gardens that were founded to serve socio-environmental roles, and the adaptation of older ‘traditional’ botanic gardens to these purposes, the botanical garden institution has taken on a particularly significant role in relation to the United Nations’s Social Development Goals (SDGs) [
80]. In the words of Dr. Paul Smith (BGCI Secretary General) in a 2018 editorial for BGCI’s flagship journal, botanical gardens have approached SDGs by “highlighting the intersections between plant diversity and sustainable development” [
81] (page 2). In the same edition, Suzanne Sharrock (Director of Global Programs BGCI) provides an illustrative table with examples of the impressive array of contributions that botanic gardens have achieved in this context — which cover all 17 SDG goals. From the goal of ending “poverty in all its forms everywhere” (SDG1), through ending hunger and achieving food security while promoting sustainable agriculture (SDG2), to reducing “inequality within and among countries” (SDG 10), or take action to combat climate change and its impacts (SDG 13) — to name but a few.
Although many botanic gardens in the global north and in the global south continue to grapple with the histories and legacies of European colonialism, with financial strife, and with the challenges of deepening environmental crisis, the successful adoption of new social-environmental roles has endowed botanic gardens with renewed contemporary relevance. It attests to the continued resiliency of this institution after 400 years of historical adaptations and transformations.