Depending upon the conditions, either nucleation or growth may be predominant over the other, and as a result, crystals with different sizes and shapes are obtained (Control of crystal size and shape constitutes one of the main challenges in industrial manufacturing, such as for pharmaceuticals).
For the region, see San Fernando Valley. San Fernando is a city located in the San Fernando Valley, in the northwestern region of Los Angeles County, California. It is completely surrounded by the City of Los Angeles.
Woodland Hills is not in the city of LA but in the western-most San Fernando Valley. Areas north like Chatsworth\ Granada Hills over to San Fernando would be north metro LA but only San Fernando is actually in the city of Los Angeles. To find north look toward Mt Wilson [above Pasadena].