After about two months, the radish are about ready to harvest. Two months is a long time for radish, but I think the slow growth is due to the lack of sunlight that I get during the winter season. In the winter months, much less sunlight reaches our backyard due to the low angle of sunlight hitting some large oak trees. However in the spring/summer time, the angle of the sun is much higher in the sky, allowing sunlight to bypass over the trees. The diagram below shows the high angle of the sun in summer and the low angle in winter. 
GARDEN PEST UPDATE: I found my Datura 'Double Purple' and Brugmansia 'Charles Grimaldi' angel trumpets are being attacked by aphids. I'm treating both by spraying with Safer Insecticidal Soap. This causes dehydration of the soft bodied insects such as aphids.
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