Sludge compost can promote greatly the growth of some flowers asscarlet sage (salvia splendens)and French marigold(Tagetes patula),and can preserve the effect longer than chemical fertilizer.

• 污泥堆肥可明显促进某些花卉（孔雀草、金盏菊和一串红）生长，并能保持长久的后效，这一点是化学肥料无法相比的。