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Irrigation, Soil & Fertility TimingBed Preparation Timing Calendar
Good beds are prepared in stages, with the slow jobs done well ahead and the finishing touches left until just before planting.
Key points
- Start new beds early; sod needs months.
- Choose a clearing method that fits your climate and timeline.
- Soil test first and apply lime early.
- Shape beds only when soil moisture is right.
- Remove the first weed flush just before planting.
What is the difference between new and existing beds?
A new bed built on sod or weedy ground needs the most lead time, because the existing vegetation has to be killed or smothered before it can be planted. An existing bed mostly needs cleanup, amendment and a final shaping.
Starting a new bed in fall for spring planting is common because it gives sod and weeds months to break down.
Bed width and layout affect work and yield. Beds should be narrow enough to reach the center from the path, and paths wide enough for your tools. Align beds with the slope or sun in a way that suits drainage and light.
How do you clear the ground?
Options include smothering with cardboard and mulch, covering with plastic, repeated shallow cultivation, mowing and solarization in hot, sunny climates. Each takes a different amount of time. Smothering generally needs a full season, plastic methods are faster in warm weather, and cultivation works only if repeated before weeds seed.
University of California guidance on solarization notes it works best in the sunniest, hottest weeks and has limits with deep perennial weeds.
Material for edging or raised beds should be chosen with care. Treated lumber, old tires and some other materials raise concerns about contaminants, so ask extension about suitable materials, especially for food crops.
When do you add amendments?
Take a soil test first. Lime takes months to change pH, so it goes on early. Compost can go on a few weeks before planting or in fall, depending on how finished it is. Do not add fresh manure close to planting or harvest of crops eaten raw, and follow food safety guidance.
For example, if you plan a spring bed and your soil test shows low pH, apply lime in fall or as soon as soil is workable, then retest before planting.
Soil in a raised bed may need different management from field soil, especially for irrigation and fertility. Test it as you would any soil.
How should you shape and finish the bed?
Raised beds drain and warm earlier in spring, which is useful in heavy or cold soils, and they can dry out faster in summer. Shape beds when soil is in the right moisture range, not when wet. Keep paths wide enough for your equipment and avoid walking on the bed itself, which compacts soil.
Rake the surface lightly just before planting for a fine seedbed. Smooth, level beds make irrigation and seeding more even.
Crop rotation helps bed planning. Group crops by family, and move them each year to reduce disease and pest buildup. A simple map of beds by year makes this easier.
What should you do between prepping and planting?
Weeds will germinate in newly prepared ground. A light cultivation or a flame or hoe pass just before planting can remove the first flush. Keep beds covered if you prepare them well ahead of time.
Check irrigation, mulch and row covers. Write down what you did and when, since notes make next year's bed work faster. Local rules may apply to herbicide use and to burning.
Succession planting changes timing. Beds that finish early can be refreshed with compost and replanted, so plan amendments between crops.
How do you handle compaction in a bed?
Avoid walking on beds when wet, and use fixed paths. If compaction is present, loosen the soil with a broadfork or fork when it is at the right moisture, then keep traffic off. Cover crops with strong roots can help over time.
Heavy tillage on wet soil often makes compaction worse. If water stands in a bed for days after rain, consider drainage solutions such as raised beds, and consult extension.
Winter protection for beds includes mulch, cover crops or row covers, depending on your region.
How do you plan irrigation for new beds?
Install drip lines or soaker hoses before planting, since they are harder to put in afterward. Check coverage and pressure with a test run. Match emitter spacing to crop and soil texture.
Mulch after planting to hold moisture and limit weeds. Check local watering rules and backflow requirements before connecting to a home supply.
Keep a sketch of the plan with dimensions. It saves time when you order amendments, irrigation parts and mulch.
Sources and further reading
Last reviewed: November 2026. Educational information, ranges only. Confirm timing with your county extension office.