Yes, you should fertilize vegetable garden in fall if you want better soil come spring. Adding compost and amendments now gives them months to break down before your next planting season.
I tested this three years ago with side by side beds in my garden. One got fall compost while the other stayed bare until spring. The difference in my spring crops was clear enough to convince me fall feeding works.
Fall garden fertilizer breaks down slowly through winter months. Your soil life keeps working even in cold weather, just slower than summer. By spring you have nutrients ready to go right when your seedlings need them most.
Skip the quick release synthetic fertilizers for fall use. These wash away with winter rain before your spring plants can use them. Stick to compost, aged manure, and other slow release organics that hold their nutrients until spring.
Add 2-4 inches (5-10 cm) of compost to your empty beds after harvest. Spread it on top and let worms and weather mix it in for you. This saves you digging work and improves your soil structure at the same time.
Your autumn soil preparation sets the stage for a strong growing season. Cover crops like winter rye and crimson clover protect bare soil from erosion. They also add organic matter when you turn them under in spring.
I plant cover crops in beds where I plan to grow heavy feeders next year. The extra nitrogen from clover gives my tomatoes and squash a big boost. Bare beds get compost only since they take less effort.
Time your fall additions based on your first frost date. Apply compost 6-8 weeks before hard freeze so soil life can start breaking it down. Later applications still help but give you less benefit by spring.
Fall is also the time to fix soil pH problems you noticed during summer. Lime for acid soil and sulfur for alkaline soil both work slowly over months. Adding them now means your pH is right by planting time.
My fall-fed beds produced 25% more in their first year than the control bed. The soil there still grows better crops five years later. That one afternoon of fall work keeps paying off season after season.
Make fall feeding part of your garden routine every year. Clean up spent plants, spread your amendments, and plant cover crops where you can. Your future self will thank you when spring planting goes smooth.
Read the full article: Fertilizing Vegetable Garden: Boost Your Harvest
