The thorny-leaved plant with miniature "pumpkins" and jalapeno-like seeds is Solanum integrifolium or S. aethiopicum ("pumpkin tree"). Related to eggplant, but Solanum family includes poisonous members (jimson weed). Don't eat. Save seeds, plant outdoors in late April.
Growing Royal Empress Tree (Paulownia) from Seed
Harvesting and Storing Pumpkin Seeds for Next Season's Planting
Growing Catalpa Trees from Seed: Stratification and Container Management
Germinating Silver Maple Seeds
Finding Erythrina crista-galli (Coral Tree) Seeds
Growing Catalpa Trees from Seed: Timing and Stratification Tips
Growing a Peach Tree from a Seed
Growing Date Palms from Seed: Timeline and Pollination Needs
Growing Cherry Trees from Seed: Stratification and Realities
Loquat Seedlings: Grafting Reality, Seed Viability, and Green Fruit Rescue
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