Soil pH Calculator
Find out which vegetables match your soil pH and how much lime or sulfur you need to adjust it for optimal growing conditions.
Data last updated: March 2026
Affects amendment rates
Your Soil pH Results
pH Scale Position
✅ Vegetables That Grow Well at pH 6.5
⚠️ Vegetables That Need pH Adjustment
Recommended Products
Soil pH Test Kits
Digital and strip test kits to measure your soil pH accurately at home.
Pelletized Garden Lime
Raise soil pH naturally. Easy-to-spread pellets for acidic soil correction.
Elemental Sulfur
Lower soil pH for acid-loving plants like blueberries and potatoes.
Frequently Asked Questions
Most vegetables grow best in soil with a pH between 6.0 and 7.0, which is slightly acidic to neutral. This range allows plants to absorb the widest variety of nutrients from the soil. Some crops prefer slightly different ranges: blueberries thrive in acidic soil (4.5 to 5.5), while brassicas like broccoli and cabbage prefer slightly alkaline conditions (6.5 to 7.5). Testing your soil pH before planting helps you match crops to your conditions or amend the soil accordingly.
How This Calculator Works
This calculator compares your current soil pH against the preferred pH range for 23 common garden vegetables. Vegetables shown in the "match" list will grow well at your current pH without any soil amendment. Vegetables in the "needs adjustment" list require you to raise or lower your soil pH before planting for best results. Amendment rates are based on agricultural extension recommendations for the three main soil types: clay, loam, and sandy soil.
Soil pH Tips
- Always test your soil pH before adding amendments. Home test kits cost under $15 and give you a reliable reading in minutes. Your local cooperative extension office also offers professional soil testing for $10 to $25.
- Lime raises pH (makes soil less acidic) and works best when applied in fall so it has time to react with the soil over winter. Pelletized lime is easier to spread evenly than powdered lime.
- Elemental sulfur lowers pH (makes soil more acidic) but works slowly, taking several months for soil bacteria to convert it. Apply well before planting season for best results.
- Clay soil requires more amendment per pH unit than sandy soil because clay has a higher buffering capacity. Loam falls in between. This is why soil type matters for calculating amendment amounts.
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