Planting pasture and crops after a flood

Why plant after a flood 

Floods and unseasonal rain can make land management more challenging. But they can also present opportunities. You may be able to make use of extra soil moisture by planting pasture, forage or opportunistic crops. 

Start by thinking about the purpose of planting: 

• Do you need quick groundcover to support soil biology?
• Are you aiming to stabilise soil and reduce erosion?
• Do you want to provide pasture or forage for livestock? 

Knowing your goal will help you choose the most suitable crop or pasture and support better planning. 

Check paddocks for disease 

Floods can spread soil-borne pathogens. One key risk is Fusarium crown rot, which thrives in wet conditions. The disease may be present even if you don’t see common symptoms like white heads or yield loss. 

Speak to your local agronomist or Local Land Services (LLS) adviser about soil testing before planting. Identifying disease early helps reduce long-term impacts on soil health and productivity. 

Check the condition of your soil 

There are a few things to consider to support pasture recovery after a flood. Before taking action, it’s worth doing a soil test to check nutrient levels. 

Waterlogging can flush nutrients from the soil and reduce oxygen levels. This affects soil structure and future plant growth. 

Using heavy machinery on saturated ground can lead to compaction. Compacted soil limits plant growth and reduces overall soil health. 

If you are planting into high soil moisture pastures, consider your irrigation options. If you are relying only on stored soil moisture for dryland growth, assess whether the crop can grow well without further rainfall. 

Choose the right crop or pasture 

A wet year can present unique planting opportunities. With enough stored soil moisture, you may be able to increase cropping activity or shorten your fallow period. In some cases, you might even consider double cropping to make use of improved conditions. 

Before planting, check your soil moisture profile. Increased cropping will place greater demands on soil nutrients and may encourage weed growth, especially where pasture has been damaged. Check for residual herbicides, which may affect germination or crop safety. 

Depending on your goals and regional conditions, options may include: 

• dual-purpose forage crops that provide both grazing and groundcover 

• temperate or tropical grasses suited to your climate and soil type 

• short-term cover crops to stabilise soil, reduce weed pressure and prepare for future sowing. 

Flood-tolerant crop and pasture varieties vary by region. Speak with your local agronomist or LLS adviser for advice. 

Manage weeds early 

Floodwaters can spread weed seeds, and damaged pastures may offer less competition. Delays in paddock access can also make weed control harder. 

Start weed monitoring and control early. Learn more about controlling weeds after a flood. 

Protect livestock health 

Grazing new pastures after flooding can increase the risk of livestock health issues such as bloat and nitrate poisoning. These risks are higher when animals graze lush regrowth, especially if they are not properly transitioned or the pasture is immature. To reduce the risk of health complications: 

• Wait until forage crops or pastures are at the right growth stage. 

• Avoid grazing hungry stock on lush pastures. 

• Use roughage to help animals adjust to the new feed. 

• Vaccinate for clostridial diseases. 

• Add mineral supplements if needed based on animal condition. 

Speak with your local vet or adviser before grazing newly sown pastures.