• 栽培さいばい — cultivation; growing plants or crops
• 水栽培みずさいばい — hydroponic cultivation
• 植栽しょくさい — planted trees or greenery along streets or in parks
• 盆栽ぼんさい — bonsai; miniature potted tree
• 栽うえる — to plant; to set seedlings in the soil

With the tree radical 木, 栽 suggests carefully arranging and tending plants — not just putting them in the ground, but raising them so they grow well.