Right side
直 supplies the sound directly: zhí. Same phonetic powers
值 worth,
植 plant,
置 install.
直 itself depicts a single straight eye gazing forward — uprightness without deviation. Faintly semantic too:
殖 covers both breeding/multiplying (
生殖) and planting/cultivating (
种植), and both senses involve setting something upright to grow — sprout, embryo, shoot.