![]() Seed dormancy appears to be widespread in the genus (confirmed in 15 species) but can vary between populations even within the same species. syriaca (broken by 2 weeks of cold stratification). fascicularis (broken by 4–6 weeks of cold stratification) and a single population of A. Seed dormancy was also detected in two populations of A. The remaining seven populations showed no dormancy. speciosa, dormancy was detected in eight populations, and this dormancy was broken by 2–4 weeks of cold stratification. We exposed seeds to cold (5 ☌) moist conditions for 0, 2, 4, 6 and 8 weeks and then moved them to 15 ☌/25 ☌ alternating temperatures. speciosa and 1–2 populations of five additional species, including A. We tested for seed dormancy and the optimum period of cold stratification in 15 populations of A. Seed germination protocols for milkweeds are not well established, in part due to the large number of milkweed species and conflicting reports of seed dormancy in the genus. ![]() Monarch larvae feed exclusively on milkweed species, primarily in the genus Asclepias, making propagation and restoration of these plants crucial for habitat restoration. Efforts to restore habitats for insects that rely on specific plant groups as larvae or adults depend on the ability of practitioners to grow and produce these plants. Pollinators in general and monarch butterflies in particular are in decline due to habitat loss. ![]()
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