Cleistocactus strausii
Silver Torch cactus can thrive in low-nitrogen soil without facing the consequences of low nitrogen. Too much water will make the plant weak and lead to root rot. 
Least Concern. This cactus is locally abundant in its native land and has few local threats to its survival.
This cactus can be propagated by cuttings or seed.
Aralia cordata
After seedlings are planted, the soil around the roots should be watered. The surroundings should be concealed with one to three inches of leaf or bark mulch, no higher than the base of the stem. It is useful to water in the morning rather than at night to prevent diseases. To prevent wilting, plants should be watered slowly and enough to achieve deep moisture, achieved by watering, waiting three minutes and watering again. To achieve water-conservation, soaker hoses, drip irrigation, distribution of mulch to prevent water evaporation, and a soil ring around the plant to retain water may be effective. It should be noted that overwatering may cause root issues. Soil drenching is effective in increasing the size of the shoots.