How do I get my White Oleander to flower?

A cutting from a freind bloomed one year. The next year I put it outside and then brought it back inside in the fall. Nearly died on me but I cut it right back and it came back to life. Three years later I have a beautiful plant but not one flower in 3 years. Any ideas?

Water Requirements - Established plantings of oleanders are considered tolerant of ordinary drought conditions. However, drought stress does have adverse effects, such as causing a reduction in growth rate and flower production. Supplemental watering at the rate of 1-2 inches per week, during dry weather conditions, promotes continuous flowering and constant growth of plants.

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Fertilizer Requirements - As in the above case of water requirements, established plantings of oleanders generally do not require fertilization, but plants may respond favourably when fertilized by increasing growth rate and flower production. Signs of unfavourable soil nutrient levels for oleanders include light green, often small leaves, short internodes, lack of terminal growth of stems and sparse flowering. A general recommendation can be used where two pounds each of actual nitrogen, phosphorous and potassium are applied for 1000 square feet area occupied by roots of the plants. The first application made in early spring followed by a second application made in early fall. Oleanders growing in lawns that are properly fertilized generally will not require supplemental fertilization.

It needs plenty of sunlight.