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The growth forms of Arachis hypogaea L. subsp. hypogaea var. hypogaea cv. ‘Florman INTA’ and A. hypogaea L. subsp. fastigiata W aldron var. fastigiata cv. ‘Colorado irradiado INTA’ were studied. Growth forms of plants taken in the same type of soil structure which had been treated with different soil management practices were compared. Both cultivars were planted into two different land plots, one of them with a normal soil profile and the other one with a soil cover ranging from 8 to 18 cm in depth. Samples of serial and subterranean parts were collected every other 10 days. Their dry weight was determined. Rain fall during the cycle was recorded. Growth forms of the two cultivars were compared since sowing to harvest time within each tested plot. Plants from hard layer soil developed certain characteristics. Internodes were found to be shortened. Decreasing number of reproductive branches with lower number of flowers in each branch was observed. A lower dry weight percentage per plant was measured. Root systems showed smaller volume. Directional growth changes in tap roots occurred and xylem tissue showed some abnormalities.