Answer: Pepper plants are heat lovers, of warm soil and warm nights, so perhaps they're not getting the heat they crave. That's about all that might stall their growth, especially if everything else in your garden is thriving. You might try placing hot caps (or empty milk jugs with the caps removed and the bottoms cut out) over the plants at night to keep them warm. Be sure to remove the hot caps every morning. This may be all they need to begin growing for you. Hope so!
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