Plant Height. Basil usually grows to a height of 12 to 18 inches (30 - 45cm). Basil plants should be spaced between 9 and 12 inches (22 and 30 cm) apart. Basil will grow in a very wide pH range between 5.1 (strongly acidic) and 8.5 (alkaline) with a preferred range of 5.5 (strongly acidic) to 6.5 (mildly acidic).Sow seed indoors before last frost or direct sow outdoors after last frost.referred pH Range. Basil will grow in a very wide pH range between 5.1 (strongly acidic) and 8.5 (alkaline) with a preferred range of 5.5 (strongly acidic) to 6.5 (mildly acidic).
Ocean spring temperatures range from an average of 60 degrees Fahrenheit (16.5 degrees Celsius) in southern California to 50 degrees F (10 C) off the state's northern beaches.
According to the Western Region Climate Centerâs California Climate Tracker, the monthly average temperature was 46.9Â°F which is 1.0Â°F lower than the long-term average of 47.9Â°F. With a statewide average of 6.41 inches, precipitation for March was 205% of the long term average.his is normally not an issue in the winter. The 8-Station Index for northern California precipitation recorded 18.5 inches in March with 18 days showing precipitation. On average, 6.9 inches of precipitation is recorded for the 8-Station index in March.