Gordon Johnson, Extension Vegetable & Fruit Specialist; gcjohn@udel.edu The following are minimum pHs for various vegetable crops. Crop Min. pH Cucumbers, cantaloupes, squash, pumpkins 5.8 Watermelons 5.5 Tomatoes, peppers, and eggplant 5.8 Cole crops (broccoli, cabbage, cauliflower, Brussels sprouts, kale, … Continue reading Minimum Soil pH for Vegetables