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Propagating and developing plants for successful transplanting will be important for the recovery of Nebraska's only endangered plant species, blowout penstemon (Penstemon haydenii S. Wats.). Therefore, the effect of various cultural treatments on seedling growth was examined in a greenhouse study. Young blowout penstemon seedlings, fertilized with both nitrogen and phosphorus, exhibited significantly greater weekly growth rates than seedlings fertilized with one or no nutrient. After removal of the upper part of the shoot to the third pair of true leaves, only those seedlings fertilized with both nutrients exhibited a temporary increase in weekly growth rate and more axillary shoots.