虹吸系统是被动水培最简单的形式，其中吸收芯通过毛细作用将营养液从储液器吸入生长介质中。植物根据需要从介质中吸收水分，无需泵、电力或定时器。
关键事实
- Completely passive — no pumps, electricity, or moving parts
- Capillary action pulls nutrient solution from reservoir through the wick into the medium
- Common wick materials: cotton rope, felt, nylon string, or fibrous growing media
- Best for small, low-demand plants: herbs, lettuce seedlings, succulents
- Not suitable for large, thirsty plants — wick cannot deliver nutrients fast enough
- Growing medium must be fine enough for capillary action: coco coir or perlite-vermiculite mixes