There are two types of cracking of tomatoes, longitudinal cracks and radial cracking. Radial cracking is mostly a varietal issue.
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Nitrogen causes stem growth as well as dark green leaf color. Adding only an iron fertilizer or chelate causes the new growth to become green but does not stimulate new growth that much.
Phone apps are good for predicting a possible freeze, but nothing replaces verification that an actual freeze happened. Maximum/minimum thermometers are a good bench check against your phone app or the National Weather Service predictions.
Once a landscape design is finished, the amount of water it needs is fixed. You won’t be able to change the amount it needs, by much, without removing plants or changing them.
It common for the chitalpa tree to partially defoliate in the summer.