NC State Extension

Hurricane Preparedness for Producers of Horticultural Crops

By Debbie Roos, Agricultural Extension Agent.

September 4, 2008

Thanks to the following contributors:

Ken Dawson, Maple Spring Gardens
Stefan Hartmann, Black River Organic Farm
Betsy Hitt, Peregrine Farm
Doug Jones, Piedmont Biofarm
Steve Moore, Center for Environmental Farming Systems

The National Weather Service has issued a hurricane watch for the North Carolina coastline as Hanna approaches, with two more storms on her tail: Hurricane Ike (currently a category 4 hurricane) and Tropical Storm Josephine. As of noon on September 4, forecasters were predicting that the Triangle area could see 2-3 inches of rain from Hanna, so hopefully it won’t be too much of a problem. But this is a good time to review some strategies to prepare your operation in the event of a hurricane. It is your responsibility to monitor the weather conditions closely and make decisions. It is my hope that the information below will give you some things to think about as you consider your options.

Note: This web page is a work in progress. Please email me if you have any suggestions for improvement.

To Plant or Not to Plant?

This is the season for planting and seeding fall crops, and some of you are wondering whether or not to plant in advance of the coming weather. This may not be an easy decision so I talked with a few farmers who have decades of experience to see what they had to say.

Alex and Betsy Hitt of Peregrine Farm near Graham have been through their share of severe weather. In 1996, Hurricane Fran brought 7-8 hours of 80 mph winds that produced downed trees, flooding, and ruined crops. They lost power for over a week.

The Hitts avoid doing any kind of soil preparation or planting prior to severe weather. Excess rains and high winds can beat down transplants, leach out fertilizer, and cause severe erosion, especially on the slightly sloping fields at Peregrine.

Stefan Hartmann of Black River Organic Farm in Ivanhoe experienced major flooding (over 25 inches of rain!) and crop loss with Hurricane Floyd in 1999. As Hurricane Hanna ponders making landfall on the North Carolina coast, Stefan is busy readying the farm. He now has lots of exposed soil since he is still planting for fall, and he is planning on disking these exposed areas to coarsen them up before the rains come this weekend. He will disk against the slope to block runoff and minimize erosion. This is for exposed soil only; if there is adequate groundcover, even if it’s just weeds, then he will not disturb the soil. Stefan will also use straw bales to block runoff in problem areas. He will not seed or plant if he anticipates getting more than 2 inches of rain (he is on well-drained sandy soils).

Steve Moore, Small Farm Manager at the Center for Environmental Farming Systems in Goldsboro, is trying to decide whether or not to plant before the storm. With two more named storms potentially coming our way on the heels of Hanna, he is worried that if he doesn’t plant now then it could be 1-2 weeks before he could plant if we get a lot of rain. Steve said that if he has a field he needed to get into quickly, then he might chisel plow it real coarsely before the storm to slow down water movement. Steve is farming flat ground.

Ken Dawson of Maple Spring Gardens in Cedar Grove uses raised beds and plastic mulch for many of his crops so he is able to continue planting ahead of a storm. If more than a couple of inches of rain are predicted he will delay direct seeding.

So…the bottom line is, you have to consider the your own unique conditions including slope, soil type, and potential for erosion and weigh these factors against the forecast for rain and wind. Planting before a storm can be risky if there is flooding or damaging winds, but waiting to plant until after the storm can also be risky if you are not able to get back into the field in a timely manner. You also risk compacting soils if you try and do tractor work on saturated soils after a storm.

Greenhouse Protection

Another big decision farmers typically face before a storm is whether or not to remove greenhouse plastic. This will depend on the strength of the greenhouse frame and the predicted strength, direction, and duration of winds.

Alex and Betsy Hitt have both Haygrove multi-bay tunnels and high tunnels. The Haygrove tunnels are not designed to withstand high winds so they usually make the decision to remove the plastic when the forecasted wind speed is over 50 mph. They said that the few hours spent removing plastic is much better than losing the entire tunnel.

Alex removing plastic

Alex Hitt removes the plastic from a Haygrove tunnel before Hurricane Charley in 2004.

Steve Moore uses Atlas high tunnels with sturdy frames that are engineered to withstand winds of up to 100 mph. Before a storm he rolls down and doubly secures the sides as well as the doors so they don’t blow in. If the power goes out during and/or after the storm, the greenhouse could lose its inflation which will cause problems for keeping the plastic on. It is helpful to have a back-up generator on hand. If he doesn’t have that then he makes sure he has lots of rope (especially if the greenhouse is vulnerable to the prevailing winds). He attaches the rope to the baseboard on one side and runs it over the ridge and attaches it to the baseboard on the other side. He will zig-zag several times over the top of the tunnel to help secure the plastic.

Ken Dawson also uses Atlas Greenhouses and he built the frame very strong with cross-trusses. He stressed the importance of rolling down the sides before the winds come because you don’t want to give the wind anything to grab. Ken doesn’t worry about removing the plastic on his strong greenhouses unless the wind is expected to be over 100 mph.

high tunnel

Atlas greenhouse at Maple Spring Gardens

Stefan Hartmann has an old tobacco greenhouse and he closes it completely and removes the plastic if winds are predicted to exceed 80 mph.

Doug Jones of Piedmont Biofarm had alot of damage to a lightweight high tunnel from Hurricane Isabel in 2003 because he didn’t remove the plastic. The winds snapped the metal frame. He is considering removing the shade cloth from his current tunnel because he feels the rough texture may make it easier for the wind to pick it up (as compared to the smooth surface of plastic).

It is very important to remember to ventilate the greenhouse as soon as possible after the storm has passed. It won’t do any good to protect the crops inside from the storm only to “cook” them after it has passed!

Other Tips:

  • Fill five gallon buckets and other containers with water prior to the storm. You’ll need it to water transplants in the greenhouse if you are on a well and have lost power.
  • Mulch as many bare rows as possible before the storm. Mulch will help prevent erosion and wind damage and will also minimize soil splashing into the crop canopy which can spread disease. Also mulch row middles on sloping ground where runoff is likely to track.
  • Pick crops such as tomatoes and melons that are ready because they will split after heavy rains. Consider harvesting cut flowers right before the storm because they will be easily damaged by rain and wind.
  • Fortify any field trellises so you don’t lose the crops they are supporting.
  • Make sure tractors and other equipment and supplies are secured. Don’t leave market baskets, picking crates, drip tape, or irrigation pipes in the field or laying around where they can become missiles in high winds or get washed away.
  • Stock up on gas for generators and other needed equipment.
  • Secure cold frames – don’t rely on gravity to keep them closed. Use a hook and eye clasp or cinder blocks to secure them.
  • Make a list of employee contact information that includes both cell numbers and land line numbers in the event of long-term power outages. Charge your cell phone fully before the storm and make sure you have a back-up phone on hand that doesn’t require electricity (like many cordless phones). Establish a means to communicate with your employees and let them know what you expect of them after the storm. Do you want them to come to work, to call you, or stay with their families? Make your plan before a storm strikes.

Harvesting Decisions for Flooded Crops

Contributed by Roger Crickenberger, North Carolina State University, in the aftermath of Hurricane Floyd

Crops intended for human consumption are considered contaminated if they have been covered with flood waters from rivers, creeks or streams.

Growers should distinguish between rainwater that accumulates on a field because of excessive rainfall versus fields covered by flood waters from risen rivers, creeks or streams. Flood waters can carry potential contaminants from off-site sources. Fields covered by flood waters are distinctly different from fields where rainwater has accumulated in low areas. Standing waters often occur after heavy rain. The present concern is for crops which have been in direct contact with flood waters from risen rivers, creeks or streams which may be contaminated with runoff such as human or animal waste, petroleum products, pesticides or industrial chemicals.

Many food crops are subject to damage or decay if they are flooded for more than a couple days, in which case the crop will either be in a state of deterioration, or it will not cure and store properly. Growers are aware of these conditions and routinely do not harvest crops of suspect quality for fear of damaging the remainder of the stored crop. In effect, these conditions will render most of the flood-affected crop unharvestable or unmarketable.

Before cleanup or crop destruction occurs in flooded fields, growers are advised to check with their crop insurance and/or their local Farm Services Agency (FSA) representatives regarding exact documentation to certify losses, procedures for initiating claims, and possible financial assistance.

If you have questions, contact the commodity specialist, your local FSA or crop insurance representatives or the Food and Drug Protection Division of NCDA&CS at 919-733-7366.

Other Resources:

Questions on Salvaging Flooded Crops – North Carolina State University

Before and After the Storm – North Carolina Cooperative Extension

Disaster Readiness – North Carolina Cooperative Extension

Disaster Programs – RAFI-USA

Farmers’ Guide to Disaster Assistance – Farmers’ Legal Action Group (FLAG)

Impact of Flooding on Organic Food and Fields – University of Minnesota

For Farmers: Safety of Foods Affected by Hurricanes, Flooding, and Power Outages – U.S. Food and Drug Administration

Trees and Hurricanes – University of Florida

This page last updated January 15, 2010.

 

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