Achieving multi-million-hectare commitments from countries around the world to restore degraded lands in resilient and sustainable ways requires, among other things, huge volumes of tree planting material. Seed systems encompassing all forest reproductive material (e.g., seeds, cuttings, stakes, and wildings), are key to ensuring that sufficient planting material with a diverse range of suitable species, adapted to local conditions and capable of persisting under a changing climate, is available for restoration projects. The ideal structure of a seed system integrates five components: seed selection and innovation, seed harvesting and production, market access, supply and demand, quality control, and an enabling environment. We propose 15 indicators to evaluate these key components and trial them by assessing national seed systems in 7 Latin American countries. We conclude that the indicators enable a straightforward assessment of the strengths and weaknesses of national seed systems, thus assisting governments to identify key areas for improvement and opportunities for horizontal learning.

High-quality, suitably adapted tree seed at volume is a key component for the implementation and long-term success of forest landscape restoration (FLR). We analysed the tree seed systems in four Asian countries—the Philippines, Indonesia, Malaysia and India—which have committed to restore in total over 47.5 million hectares of degraded lands by 2030. We assessed the national seed systems using an established indicator framework, literature review and expert surveys and interviews. Additionally, we surveyed 61 FLR practitioners about their challenges in acquiring seed to understand how the strengths and weaknesses identified at the national level were reflected in FLR projects on the ground. Identified key constraints common to the studied countries are (i) a mismatch between the growing demand for priority native species and the limited seed supply in terms of quantity and quality, (ii) lack of effective quality control for seed of native species and (iii) lack of information about the effects of climate change on native species to guide species selection and seed sourcing and to improve the resilience of restored ecosystems. We discuss options to strengthen seed systems for native tree species both in terms of quality and volume to enable them to effectively respond to the national FLR commitments and make recommendations on promising technical solutions.

Commitments to Forest and Landscape Restoration are rapidly growing and being implemented globally to tackle the climate and biodiversity crises. Restoration initiatives largely based on tree planting necessitate an increased supply of high-quality and suitably adapted tree planting material. We evaluated the native tree seed supply systems in Burkina Faso, Cameroon, Ghana, and Kenya, four countries with large commitments to increase tree cover. We applied an established indicator framework to assess the adequacy of any current tree seed system to meet national needs. The study aimed to analyse (i) how well-established the native tree seed supply systems are, (ii) how public and non-public actors differ regarding the perception of existing seed systems, and (iii) the main barriers to strengthening current seed systems. Our findings identified significant gaps in the native tree seed supply systems of the four countries, arising particularly from shortfalls in the enabling environment. We found a lack of involvement of local community members in the seed systems, with a crucial need for strengthening policy, capacity building and investment in seed systems. We propose a multi-stakeholder approach and the application of online tools to improve seed systems to meet the demand for high-quality native tree seeds.

Integrating diverse trees and shrubs (hereafter ‘trees’) in agricultural landscapes has emerged as a crucial nature‐based solution to the triple challenge of biodiversity loss, climate change and food security. The potential benefits of on‐farm trees for both people and nature, however, are often constrained by inadequate consideration of local socio‐ecological factors and an overall lack of species diversity. A deeper understanding of what drives farmers' decision‐making in diversifying farm trees is needed to ensure that scaling up tree‐based restoration efforts in smallholder landscapes delivers the promised benefits locally and globally. We conducted surveys with 620 smallholder farmers across Vihiga County in Western Kenya using an extended version of the Theory of Planned Behaviour to investigate potential drivers of smallholder intentions to grow more diverse woody plants on their farms. Data was analysed using Structural Equation Modelling (SEM). We found that farmers were more likely to diversify on‐farm trees if they had completed education beyond secondary school, derived all their income from their farms, were household heads and were among the wealthiest 20% of farmers. Our results revealed that farmers' decisions about increasing tree diversity were also influenced by socio‐psychological factors, namely their past experiences, the perceived behaviour and opinions of other farmers, their confidence in their ability to increase tree diversity, and their attitudes toward the expected outcomes of growing a wider range of tree species. Key barriers preventing farmers from diversifying were concerns about attracting harmful wildlife, decreasing soil fertility, small farm sizes, lack of time and knowledge, and certain cultural beliefs about planting trees. Synthesis and applications . Understanding the factors influencing farmers' intentions to increase tree diversity on their farms has substantial implications for the success of nature‐based solutions in Western Kenya and other densely populated smallholder landscapes. Addressing the identified barriers and enablers is crucial to design targeted interventions to promote sustainable tree diversification practices among smallholders to bolster local livelihoods and food security while contributing to biodiversity conservation and climate change mitigation. Read the free Plain Language Summary for this article on the Journal blog.

Proximity to natural habitat is known to enhance pollination services in large‐scale agriculture, but it remains unclear whether this holds in tropical smallholder farms. These systems are embedded in ecologically complex landscapes, central to global food security, and depend heavily on biodiversity‐derived ecosystem services. We conducted a systematic review and meta‐analysis of 35 studies assessing the relationship between distance to natural habitat and pollinator abundance, species richness, and crop fruit set in tropical smallholder farms. We found no consistent patterns in pollinator abundance and crop fruit set with increasing distance, with relationships highly variable across studies. Similarly variable, yet slightly negative, was the relationship between distance and pollinator species richness. Our findings suggest limited support for the ‘proximity to natural habitat’ hypothesis in tropical smallholder farms, indicating that the inherent complexity of these landscapes may buffer negative effects of distance on pollination. This underscores the importance of maintaining and restoring landscape complexity to sustain biodiversity and ecosystem services such as crop pollination. We also highlight the need for greater methodological consistency and publicly available raw data in future studies to strengthen the evidence base and support management strategies for safeguarding pollination services in tropical smallholder farms.

Proximity to natural habitat is known to enhance pollination services in agricultural landscapes, particularly in large-scale industrialised farms. However, it remains unclear whether these patterns hold in tropical smallholder farms – ecologically complex landscapes that sustain millions of the world’s most food-insecure communities and depend heavily on biodiversity-derived ecosystem services. Here, we present a systematic review and meta-analysis of 32 studies assessing the relationship between distance from natural habitat and pollinator abundance, species richness, and crop fruit set in tropical smallholder farms. We found no consistent effect of distance on pollinator abundance and crop fruit set. While pollinator species richness declined with increasing distance to natural habitat, especially when excluding managed honeybees, this relationship was highly variable across studies, constraining the generalisability of observed trends. Our results thus indicate that diverse smallholder landscapes may buffer against negative effects of distance to natural habitat on pollination services. Yet, variability in study methodologies and spatial scales – ranging from a few hundred meters to several kilometres – limits the ability to determine clear patterns. More standardised, open-access research is needed to clarify the nuanced pollination dynamics in tropical smallholder farms and inform conservation strategies that support both biodiversity and rural livelihoods.