Complete Guide to Planting and Caring for Perennials

Perennial Basics

Most perennials come in 4-inch or 1-gallon containers; mail-order sources often ship bare-root. They generally prefer organically amended soil but many tolerate ordinary or poor conditions. Sun and water needs vary widely—some thrive in full sun, others need shade in hot climates; some are thirsty, others drought-tolerant. Most appreciate annual feeding (organic amendments in spring/fall or complete fertilizer in spring), though heavy feeders need regular fertilizing throughout the season.

Space for Mature Growth

Research ultimate height and spread before planting. Some reach 7-8 feet tall; others are ground-hugging. Nursery plants a few inches wide may become 3-4 foot mounds. Space accordingly to avoid crowding.

Deadheading and Trimming

Regular maintenance keeps perennials looking their best. Deadheading (removing spent flowers) maintains appearance and can extend bloom by weeks. After spring bloomers finish, cut all stems and foliage back by one-third—new growth fills in quickly. For summer/fall bloomers, pinch terminal buds early for bushier growth, or cut entire branches back a few inches. Some top-heavy bloomers need staking—options include simple wood/bamboo stakes, circular grids, or flexible frames.

Dividing Perennials

Divide to rejuvenate crowded plantings and gain new plants. Only feasible for clump-forming perennials with expanding root masses—not taprooted plants (increase those via root cuttings or seed).

Timing: Spring/early summer bloomers—divide in fall. Late summer/fall bloomers—divide in spring.

Division Steps:

1. Water thoroughly 1-2 days before dividing.
2. Cut around clump 6-12 inches beyond perimeter with spading fork/shovel; dig under roots to loosen completely.
3. Remove excess soil (rinse if needed) to reveal natural division points.
4. Divide using appropriate tool: shovel/ax for tough roots, knife/pruning saw for fibrous roots, pruners/trowel for smaller clumps, hands for loose ones.
5. Cut large divisions' foliage back to 4-6 inches. Keep divisions damp and shaded while preparing planting area.
6. Amend soil with organic matter; add high-phosphorus/potassium granular fertilizer for root development.
7. Plant divisions, keep well-watered until established. Can also pot up for later planting or sharing.

Larger divisions establish and bloom faster than many small ones.