Answer: Nothing wrong with the soil or with the plants. When flowers fall off without developing into fruits it indicates lack of pollination. This might be because there are no pollinating insects around or that the temperature is too cool or too warm. Tomato plants are wind pollinated. You can sharply tap a branch with open flowers to dislodge the pollen and make it fall into the receptive parts of the flower. Squash plants are a little different. They develop separate male and female flowers. The male flowers are attached to straight stems; the female flowers will have a slight swelling directly behind the petals. Pollen from the male flowers must be transferred to the female flowers. Squash plants often produce more male blossoms than female blossoms so not all flowers will develop into fruit. You can help mother nature along by removing a male flower and brushing the insides of the flower with the insides of the female flowers. You'll be transferring pollen and the female flowers should develop fruits. Good luck with your garden!
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