The paper presents an example of precision regulation of soil moisture in the active layer of the Sapphire Storm (Lycianthes rantonnetii) decorative bush. The effectiveness of three irrigation systems was analysed. Systems One and Two were built based on drip-feed lines placed on the soil surface or 5 cm beneath the soil surface. System Three was built with the use of a hose with needle-type drop emitters. The study demonstrated the applicability of time-domain reflectometry (TDR) for the determination of soil moisture within the root mass of a drip-irrigated plant. It was found that the amount of water used, necessary to ensure optimum moisture conditions for the plant, was the lowest when the system with needle-type drop emitters was employed. Moreover, it was determined that precision control of soil moisture requires a solution of the problem of mutual location of the irrigation emitters and of the points of placement of the sensors measuring the moisture value under control.