Urban Food Forest Garden Yields, Two Years In

Here are the final figures for the garden yields for the period of Oct 2009 – Oct 2010, the garden’s second year.

The annual production for this first year was 202kg, up 71kg from last years 131kg. The total garden bed area is 686 sq. feet (64 sq. metres).

The average monthly amount of produce was just over 15kg, up 5kg per month from last years 10kg.

Here are some statistics which break this down further:

This graph is colour-coded for season – yellow (summer), orange (autumn), brown (winter) and green (spring).

The only anomalies are the “low-spots” in July and September, this is what happens when you forget to plant your seasonal annuals!

If we look at the monthly production figures:

Month	Yield (grams) (2008-2009)	Yield (grams) (2009-2010)
Jan	22,203	6,385
Feb	10,860	13,891
Mar	11,018	16,700
Apr	3,748	49,056
May	15,566	28,277
Jun	11,251	40,136
Jul	14,341	3,085
Aug	4,128	21,804
Sep	11,155	846
Oct	11,252	19,351
Nov	6,149	1,170
Dec	9,556	1,274
Monthly Average	10,936	15,909

Where there are decreases in yield for the month, it’s mainly due to my forgetfulness to put in annual seedlings, harvest annuals before they went to seed, and another big one, forgetting to harvest a whole harvest of potatoes – I get around two harvests a year. I just left the potatoes in the soil and they sprouted once again, by then it was too late…

Even with human error, the garden still remains highly productive, and significantly more so than before. Like I mentioned, annuals are the source of most of the work in any garden, hence my preference for perennials. Since my garden is a demonstration Permaculture garden, I run many garden tours, and I’ve had hundreds of people come and visit in the last two years. One of the strangest observations I’ve had often is “I can’t see much/any vegetables!” I produce more vegies than most urban gardens, but because I use an over-stacked food forest design, there aren’t neat rows of any vegetables anywhere, and not surprisingly, I don’t have pest problems or crop rotation problems with any vegetables, just the occasional scale on the citrus trees thanks to the ants farming them, putting them there and protecting them!

The most amusing comment I’ve had to this website was from a gentleman looking at the pictures and commenting “even though your garden is mainly ornamental…). I thanked him for what I saw as a great compliment, he was suggesting that the garden was aesthetically pleasing to look at, wow, how great, it grows that way mainly on its own! I did promptly remind him that it’s really a food garden though! So there you go, it works well, looks great, and produces lots of food. Permaculture proof of concept, you betcha!

If we break down the figures by type of produce (fruits, vegetables and berries), we can see the how much productivity we got in each of these categories.

Fruit	Yield (g)
apple (granny smith)	854
apple (pink lady)	1,360
babaco	2,486
cherry guava	74
fig	2,079
grapes (sultana)	8,763
mandarine	61,602
orange	516
peaches	2,234
pomegranate	47,755
total	127,723
last years total	53,636

This year, fruit production increased by 71%. This increase is expected, as the backyard orchard, which is very young, matures enough to start producing fruit. Over 70% of the fruit trees in the garden have yet to bear any fruit, due to their age, 2 years or younger. Over the next three years, all of the trees will be producing, and the expected yields will be significantly higher across all trees as the years progress.

Berries	Yield (g)
blackberry	165
goji berry	50
raspberry	3,022
raspberry (large)	215
strawberry	569
total	4,021
last years total	2,584

The performance of the berries has been outstanding this year, yields have increased by 56%. This year I also added a few more berries in the garden – youngberries, thornless blackberries, loganberries, thornless gooseberries, black currants, red currants and golden currants. With this many additional varieties of berries, it’s going to be berry self-sufficiency.

Vegetables	Yield (g)
artichoke	111
asparagus	646
beans (climbing)	2,193
broad beans	15,775
capsicum	299
celery	187
chilli (jalepeno)	273
eggplant	453
french sorrel	288
jerusalem artichoke	6,580
kale (western front)	180
lemongrass	690
lettuce	480
parsley	152
peas	28
perpetual spinach	52
potato (desiree)	1,093
potato (kipfler)	792
potato (red rascal)	2,346
potato (russet burbank)	7,439
red dandelion chicory	66
silverbeet	50
snowpeas	45
tomato	15,259
yacon	14,754
total	70,231
last years total	75,052

This year I actually got 5kg less vegetables than the year before, as I forgot some of my annual planting, though whichever way you look at it, 70kg of vegetables from a 64 square metre garden is a pretty good!

Incidentally, if some of the yields look absurdly low, like 52g of perpetual spinach or 152g of parsley, that’s because that’sall that was harvested, there was kilos of the stuff, but if it wasn’t harvested, or if it ends up being composted or going to seed, it doesn’t get counted. The garden actually produced a heap more leafy greens than the statistics indicate, they just weren’t used, and therefore not part of the harvest figures.

To get some perspective on these yield statistics, we see that production is commonly measured in terms of yield/acre.

• One acre is approximately 4047 sq. meters

Now, if we look at my garden, still in its infancy at two years of age, its production is:

• 202kg/64 square metres

To convert this to acres, we do dome simple maths: 4047/64 = 63.23 (so you can squeeze approximately 63 of my whole gardens into one acre!)
Now, a bit more math to get the yield per acre: 202×63.23 = 12,773kg/acre

So, my 2 year old fledgling garden that is just getting started is producing the equivalent of 12,773kg/acre, in other words, close to 12.77 metric tonnes per acre!

I’m looking forward to seeing how high I can get production – remembering it’s all organic, no pesticide other than a rare use of organic neem horticultural soap or white oil, and no fertilizer other than the compost and worm casting liquid, and the rare donation of a small bag of manure that I get when I give people free plants.

For the next twelve month’s I’ll just publish the harvest figures month by month, I’ve become quite accustomed to weighing almost everything coming out of the garden over the last two years!

Now I’ve filled this garden, and I have no more space left, I’ve started working on other people’s gardens, and some community garden projects, so I might publish some of those projects too, for it can’t always be about my garden!