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  <title>Institute of Gardening</title>
  <link>https://instituteofgardening.com</link>
  <description>Horticulture course comparison and growing-guide library</description>
  <pubDate>Mon, 31 Aug 2026 22:13:35 GMT</pubDate>
  <item>
    <title>Page Not Found</title>
    <link>https://instituteofgardening.com/</link>
    <description>The requested horticulture guide or tool could not be found.</description>
  </item>
  <item>
    <title>Horticulture Courses & Growing Guides</title>
    <link>https://instituteofgardening.com/</link>
    <description>Unbiased comparison of RHS qualifications and an evidence-based library for growing, composting, and soil science.</description>
  </item>
  <item>
    <title>Growing Tomatoes (Solanum lycopersicum)</title>
    <link>https://instituteofgardening.com/guides/tomatoes</link>
    <description>Evidence-based guide to yield maximization, blight resistance, and pruning cordons.</description>
  </item>
  <item>
    <title>Rose Cultivation and Pruning</title>
    <link>https://instituteofgardening.com/guides/roses</link>
    <description>Physiological pruning principles and black spot epidemiology.</description>
  </item>
  <item>
    <title>Thermal Composting Fundamentals</title>
    <link>https://instituteofgardening.com/guides/composting</link>
    <description>The chemistry of decomposition: achieving 60°C and balancing the C:N ratio.</description>
  </item>
  <item>
    <title>Growing Potatoes (Solanum tuberosum)</title>
    <link>https://instituteofgardening.com/guides/potatoes</link>
    <description>Yield calculations, scab prevention, and chitting debates.</description>
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  <item>
    <title>Growing Guides</title>
    <link>https://instituteofgardening.com/guides</link>
    <description>Evidence-based guides for growing and soil management.</description>
  </item>
  <item>
    <title>Soil pH and Nutrient Availability</title>
    <link>https://instituteofgardening.com/guides/soil-ph</link>
    <description>How soil chemistry dictates plant health and why pH is the master variable.</description>
  </item>
  <item>
    <title>RHS Level 2 Certificate: Is it worth it?</title>
    <link>https://instituteofgardening.com/courses/rhs-level-2</link>
    <description>A brutal breakdown of the RHS Level 2 Certificate in the Principles of Plant Growth and Development.</description>
  </item>
  <item>
    <title>Online vs In-Person Horticulture Courses</title>
    <link>https://instituteofgardening.com/courses/online-vs-in-person</link>
    <description>Data-driven comparison of distance learning versus college attendance for RHS qualifications.</description>
  </item>
  <item>
    <title>RHS Level 3 Certificate: Advanced Horticulture</title>
    <link>https://instituteofgardening.com/courses/rhs-level-3</link>
    <description>An analysis of the supervisory-level RHS Level 3 qualification.</description>
  </item>
  <item>
    <title>Horticulture Courses</title>
    <link>https://instituteofgardening.com/courses</link>
    <description>Comparison of RHS qualifications and study methods.</description>
  </item>
  <item>
    <title>Plant Spacing Calculator</title>
    <link>https://instituteofgardening.com/tools/plant-spacing</link>
    <description>Calculate exact density for intensive beds based on canopy diameter.</description>
  </item>
  <item>
    <title>Soil Amendment Calculator</title>
    <link>https://instituteofgardening.com/tools/soil-amendment</link>
    <description>Calculate elemental sulphur or garden lime requirements to adjust soil pH.</description>
  </item>
  <item>
    <title>Frost Date Tracker</title>
    <link>https://instituteofgardening.com/tools/frost-date</link>
    <description>Understand calculating growing degree days and frost probabilities.</description>
  </item>
  <item>
    <title>Peat-Free Potting Mix Blender</title>
    <link>https://instituteofgardening.com/tools/potting-mix</link>
    <description>Ratio calculator for peat-free substrate formulation.</description>
  </item>
  <item>
    <title>Seed Starting Timeline Calculator</title>
    <link>https://instituteofgardening.com/tools/seed-starting</link>
    <description>Back-calculate sowing dates from your local last frost date.</description>
  </item>
  <item>
    <title>C:N Ratio Calculator</title>
    <link>https://instituteofgardening.com/tools/compost-ratio</link>
    <description>Balance greens and browns by dry weight for optimal thermophilic composting.</description>
  </item>
  <item>
    <title>Irrigation Volume Calculator</title>
    <link>https://instituteofgardening.com/tools/water-volume</link>
    <description>Convert mm of rainfall requirement to litres per square metre.</description>
  </item>
  <item>
    <title>Mulch Volume Calculator</title>
    <link>https://instituteofgardening.com/tools/mulch</link>
    <description>Determine cubic metres required for specific depth weed suppression.</description>
  </item>
  <item>
    <title>Horticulture Tools & Calculators</title>
    <link>https://instituteofgardening.com/tools</link>
    <description>Calculators for spacing, soil amendment, and irrigation.</description>
  </item>
  <item>
    <title>NPK Ratio Analyzer</title>
    <link>https://instituteofgardening.com/tools/npk-ratio</link>
    <description>Analyze fertilizer mixes and convert oxide forms to elemental values.</description>
  </item>
  <item>
    <title>Raised Bed Volume Calculator</title>
    <link>https://instituteofgardening.com/tools/raised-bed</link>
    <description>Calculate soil volume required to fill raised beds.</description>
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