What are Annual Plants?
Annuals plants go from a planted seed to producing a seed within a year. They complete their whole lifecycle in one year or season. Annual plants make up most of our vegetable crops, and many of them can be harvested within 2 to 3 months after sowing. (Bi-annual plants are simliar to annuals but they may live up to two years before producing seeds and coming to the end of their lives.) Perennial plants are those living more than 2 seasons. (See planing perennials and fruit trees in school gardens)
Annuals are generally classified as a “warm season” crop or a “cool season” crop
Cool season crops thrive in cool areas or during cooler months of the year. They can often withstand frost.
- Generally they are the root, stem, leaf, and flower bud crops.
- In mild winter areas many of these crops can “overwinter” if planted in the fall or can be planted in early spring for a late spring harvest.
Warm season crops thrive in warm areas or during the hotter months of the year. They cannot tolerate frost.
- Generally they are the fruit and seed crops.
- They are planted in the spring – summer.
Gardeners use planting charts or the information found on seed packets, along with average frost dates, to determine when to plant an annual plant. Both planting charts and seed packets refer to weeks before or after “last frost” dates as a guide of when to sow seeds or plant transplants outdoors.
Contact your local Master Gardener (In CA visit www.mastergardeners.org, your nursery professional, or the following to find out your region’s frost dates.
Planning Your Planting Times
Start by finding your average frost dates:
- Victory Seeds lists frost dates for Canada and the U.S.
Then use information on seed packets or a planing guide like these:
- Johnnyseeds.com – just enter your average last frost date and their tool will estimate your planting times
- Life Lab’s Planting for a School Year Harvest – a simple list of edible crops suitable for mild winter area planting.
- Territorial Seed Spring and Fall/Winter Garden Guides They also include great information about growing a fall/winter garden (which is great for schools) Note: in mild winter areas some crops can be planted a couple weeks later than noted in their chart, but don’t wait too long, you want your little plants to be establish before day light decreases and temperatures drops.
- National Gardening Association’s Food Garden Guide : Detailed information on planting, care and harvesting of garden plants.
- Burpee.com : Great information on gardening and seed catalog, sign up for regional garden reports, visit their “library” for plant care and harvest information. visit their “nutrition guide” for vegetable nutrient content and garden kitchen tips.
- Sample School Garden Planting Guides for DC Schools and for Tucson, AZ Schools
Learn how to read a seed packet:
Planning Your School’s Edible Harvest
One of the most challenging aspects planning a school garden harvest is that most crops are ready for harvest in the summer months when most schools are out of session. With a bit of planning you can create a crop harvest schedule that fits with your school year.
Here are the three main “windows” for planting and harvesting in a traditional school year calendar:
- Late Spring Harvest – cool season crops planted in late winter-early spring can be harvested before school lets out.
- Fall Harvest – warm season crops planted in late spring (right before school lets out) can be harvested when school starts back up assuming the garden is watered and weeded during the summer.
- Fall/Winter Harvest – cool season crops planted in late summer-early fall can be harvested in the late fall-winter time.
Seed packets and crop information sites list the “days to harvest”. The days to harvest are an approximation of how many days it will take for your plant to go from a newly sown seed to an edible treat. Refer to days to harvest to help plan your harvest dates. It is simple as setting the day you’d like to harvest a crop, finding the days to harvest of the particular crop and then counting backwards to determine your sowing date. Of course there are many other variables like the weather, irrigation, fertilization, and pests that may accelerate or retard a plants growth but all of those variables are learning opportunities for the gardener(s).
Click for Edible Crop Planning Resources including the chart above:
- Annual Crop Planning for School Garden and Crop Planning Worksheet – a PDF summary of the information on this page.
- Edible Theme Garden Calendar – an Excel document created for the Central Coast of California which can be modified for your growing conditions.
- Edible Theme Garden Plans – edible theme seed packet collections and lesson ideas on how to teach crop planning to adults and older students.
Planning a Fall Harvest
One mistake many new school gardeners make is planting a garden that matures during summer while students are away. If you are serious about harvesting vegetables in the fall, pick long season vegetable varieties. Read the “days till harvest” listing on the back of seed packages and plan accordingly. If you want to eat fresh corn in September with your students, plant 90-100 day corn in late May instead of 70 day corn. Better yet plant crops that can dry in the garden like popcorn. Popcorn can dry in the field for weeks once mature whereas sweet corn needs to be harvested within a week or two window. Also remember that many vegetables need to be harvested to keep producing throughout the summer so make sure your summer garden guardians harvest regularly to encourage continual fruiting. It is also a good idea to plant later in the spring or in early summer so that the crops will mature later in the summer or early fall when students return to school
Try planting some of these crops in late May or June and come back to school with something to harvest.
|Popcorn||Shelling Bean (dry beans)||Edible / Birdseed Sunflowers||Winter (Hard) Squash or Pumpkins|
|Tomatoes||Parsnip||Health Master Carrots||Amaranth|
Try planting a Three Sisters Garden with popcorn, winter squash, and dry beans. Our friends at www.kidsgardening.org have a good article on the Three Sisters Garden.
Gateway School Garden in Santa Cruz has a great annual planting plan that includes grade specific edible theme beds with academic connections. See Gateway’s Life Lab Year Round Plan
Check out our tips for school garden summer care.