Positioning, light and temperature

Light is not negotiable. Edible plants need at least four hours of direct sun daily; herbs and tomatoes want six to eight. In a van, this means your dashboard, roof rack, or a folding table outside. Inside the van, even near a window, light is too dim for anything except microgreens or shade-tolerant herbs like mint and parsley.

Dashboard growing works for small pots in winter and spring. In summer, dashboard temperatures exceed 60°C — nothing survives. Move plants outside or into the shade of an awning. Roof racks give excellent light and airflow but expose plants to wind, which dries compost fast. Secure everything with bungees or cargo netting.

Temperature swings are the hidden killer. A van in summer sun can reach 45°C inside; at night it drops to 12°C. Tomatoes and basil hate this. Insulate pots with bubble wrap or fabric pot covers. Park in dappled shade during heatwaves. In winter, bring tender plants inside at night or wrap them in fleece.

Strategic parking: a van parked east-facing gives morning sun (gentle, good for basil and salad). South-facing gives all-day sun (too much in summer, perfect in spring and autumn). West-facing gives afternoon sun (hot, good for tomatoes and chillies). North-facing is for sleeping, not gardening.