Flower Application Rates

Milorganite application rates for flowers

Quick Tips

  • Add Milorganite to give your flowers the nutrients they need
  • Annuals - too frequent watering promotes surface root growth
  • Perennials - water weekly to rooting depth

Annuals play the starring role in the story of your garden. To get the most visual pop, you need to give your annuals all the nutrients they need to grow big and beautiful. Follow the tips and rates below and prepare for rave reviews.

Annual Flower Rates
When to Apply Application Rate*
Prior to planting 1 ½ lbs (4 ½ cups) per 50 sq ft
Budding 1 lb (3 cups)  per 50 sq ft
*Conversion: 3 cups of Milorganite = 1 pound

Perennials are the supporting actors, giving depth and texture to your garden. They develop more gradually, which makes them perfect candidates for a slow-release organic fertilizer.  Apply in spring and again after plants bloom to strengthen plants for the following year.

Perennial Flower Rates
When to Apply Application Rate*
Prior to planting** 2 ½ lbs (7 ½ cups) per 50 sq ft

Spring and summer

2 ½ lbs (7 ½ cups) per 50 sq ft
*Conversion: 3 cups of Milorganite = 1 pound
**For large plants, add an additional ½ to 1 lb of Milorganite with soil in the bottom of the planting hole.
Planting & Watering
  • Till the soil 2 to 3 inches below rooting depth.
  • Break up any clods and remove sticks and debris.
  • Water the annuals well at planting or transplanting.
  • After plants reach mature size, water them twice a week to rooting depth. Too frequent of watering promotes surface root growth, which can limit plant vigor.

  • Remove any sod or previous plantings from the area you wish to plant.
  • Till the soil to at least 6 inches below rooting depth.
  • Plant according to specific directions for each type of perennial you choose.
  • Water the plants thoroughly when transplanting. Keep the soil moist until plants set. Then, water the plants weekly to rooting depth. Shallow watering encourages shallow roots, which can stress plants during hot and dry summer conditions.
  • Mulch around the plants to protect roots from hot summer weather and to help control weeds. Remove dead flowers to encourage further new buds and flowering.