Aglaonema Red Siam is a great beginner plant due to its ease of care. Like all Aglaonemas, this variety enjoys warmth and high humidity levels, but will tolerate moderate humidity as well. Over time it will grow into a lush, bushy plant. This plant can be propagated from stem cuttings or by separating offsets from the main plant.. This plant should be fertilized monthly through the spring and summer, with a general houseplant fertilizer diluted by about half.