Excerpts from Jim Conrad's
Naturalist Newsletter

from the February 19, 2017 Newsletter issued from Rancho Regenesis in the woods ±4kms west of Ek Balam Ruins; elevation ~40m (~130 ft), N20.876°, W88.170°; north-central Yucatán, MÉXICO
RADISH PLANTS NOT PRODUCING RADISHES
Throughout my life I've produced many successful radish crops but here at the rancho two attempts this season have failed. Radish plants, RAPHANUS RAPHANISTRUM ssp. SATIVUS, were domesticated in temperate Europe, so in the Yucatan I haven't even tried to grow them during our hotter months. My radish beds always have been sown in January and February, and the results were good.

But, below, take a look at the lower part of Radish plants in my current garden:

undeveloped radishes

Instead of radishes, this season my plants have produced slightly thickened red stems. Only a few plants developed what could be called radishes, but even they are narrow and not well formed, as seen below:

poorly developed radishes

From a variety of pages on the Internet I find the following reasons a Radish plant might not produce a radish:

Of the above reasons, the two that apply to my situation are "too much nitrogen" and "too hot." I worked a good bit of nitrogen-rich cow and burro manure into my radish beds. Also, this January and February in the Yucatan have been unseasonably warm, much warmer than during earlier seasons elsewhere when I've enjoyed good crops.