Yam can nourish qi and yin, tonify spleen, lung and kidney, and stop leukorrhagia. Can be used for treating diabetes with spleen and stomach weakness, lung and kidney weakness, yin deficiency with internal heat, thirst and frequent urination.
Astragalus membranaceus can invigorate qi and yang, strengthen exterior, induce diuresis to reduce swelling, support sores and promote granulation. Used for qi deficiency of spleen and stomach and stagnation of middle qi; Lung-qi deficiency and spontaneous sweating due to exterior deficiency; Qi deficiency syndrome and exogenous syndrome; Edema and dysuria caused by qi deficiency and water dampness; Deficiency of qi and blood, abscess stuck in pus and not healed for a long time; Qi deficiency and blood deficiency have sallow complexion and weak pulse; Qi deficiency, hematochezia, metrorrhagia; Joint pain, numbness of limbs or hemiplegia caused by deficiency of qi and blood; Diabetes mellitus with deficiency of qi and fluid.
Yam can be used as both medicine and food frequently, and yam is a good medicine!
You can add astragalus when you make a boat, so put it less first. Some people get angry when they eat it.
As for Morinda officinalis, I'm not sure about the answer.