To Prune or Not to Prune, that is the Question!
Prune at your own discretion. I suggest reading about each perennial or fruit plant before digging in with the gardening shears. I’ve learned by reading and practice which of my plants need pruning and when. Woody plants such as hydrangea, azalea, rhododendron, and some chrysanthemums only need pruning for shape. Their blossoms grow on “old growth,” so if they get cut back to the ground, you’ll have no flowers the following season.
However, many perennials will need to be cut back each year (in autumn or spring) to both clean up the flower bed and to encourage new growth. I go a bit prune-happy and cut most perennials in autumn. Tree leaves stick around in the flower beds, even after raking, providing shelter for animals and coverage for roots and bulbs. Flowers with heads that have gone to seed (such as black-eyed Susan, coneflowers/asters) can also be left until spring for pruning, as they provide seeds for birds to eat during winter. As for fruit, apples and blueberries can be pruned in spring; everbearing (twice blooming) raspberries get cut down in the autumn. This is also a great time to shape any evergreens you have, like hollies or overgrown euonymus.
Fertilizing and Winterizing
Don’t forget to feed the flower beds with a slow-release fertilizer. The rule is to give our perennials their treats with the “treat” holidays here in the USA (around Easter in March/April and Halloween in October). For most of my flowers a broad 8-8-8 or 10-10-10 fertilizer (granular, sprinkled on the flower beds) suffices. I use a more acidic fertilizer for azaleas, rhododendrons, hydrangeas, and blueberries.
When it comes to preparing the vegetable beds, there are several things to do for winter: clean out diseased plants, remove all the spent plants, clear out weeds, plant cover crops such as clover to prevent erosion (optional), amend the soil with compost, manure, leaves, straw, leaves, bone meal, and fertilizers, and replenish soil and mulch as needed. Some plants can stay. I left oregano last year and it has taken over part of a bed.