Forest Garden documents what we are growing at our homestead in central Florida, central zone 9. There are a few freezing
nights here each year but almost always separated by a number of warmer days. The dry season is from October to May,
averaging 25 inches of rain. The wet season from June to September gets another 25 inches of rain. The sun is very
intense, and it's very humid almost every night of the year.
We are planting on about one acre and we have six to eight very large oak trees here casting a lot of shade. About half of
the ground gets between 4 and 6 hours of direct sun in the winter and between 6 and 8 hours in the summer. The rest gets
between 0 and 3 hours of direct sun in the winter and 2 to 5 hours in the summer. There is a very gentle slope here so little air
pooling. Wind comes from all directions. North wind is cold and south wind is warm.
More detailed climate features include high variability of weather within each week as winds shift often, usually between warm southeast
and cool northwest. Some winters see a string of weeks with half clear/cold days, and half warm/wet days, causing excess ground moisture
due to slow drying. Other winters are relatively clear, causing excess ground cooling. The summer wet season length varies considerably.
The benefits and liabilities of each variation are much different, creating considerable needs for frequent adjustments to maintain ideal
microclimates for the plants.
The soil here is yellow sand with topsoil between 6" & 12" depending on density of trees, and consistently well-drained. This soil dries
out very fast after rains, and is notoriously infested with root-knot nematodes, which are reduced in winter, with moisture, and with
organic matter in soil.
Central Florida gardens risk heat stress from sun, wind, quick-drying soil, and humid nights raising soil temperature.
In this environment, we think mulching is an essential garden practice. We warm the soil in winter by removing mulch and cool soil in summer
by adding mulch. We add mulch as the air temperature warms up in spring. Consistent soil moisture, especially with compost application, enhances soil
micro-organism populations increasing nutrient availability to plant roots. Mist evaporated from plants before dusk averts pathogens. Allowing topsoil
to dry periodically also averts pathogens and, along with deep watering, encourages deep rooting.
Though variable, our climate tends toward a 9 month dry season and a 3 month wet season in June/July/August. In the dry season we rely on mulch
to retain soil moisture, allowing the top few inches of soil to dry for a week before replentishing and allowing the deeper soil to dry for a month
before replentishing, in the warmer months. In the colder months these wait periods may double and triple respectively.
We plan to build a rainwater catchment system for watering during the dry periods, given that our sandy soil dries fast. We find that a sunny sky
and dry soil is a combination that does not grow trees particularly well, and likewise a cloudy sky and moist soil. Instead, we find that a sunny
sky and moist soil is a combination that grows trees particularly well, facilitated by rainwater catchment.
Risk of heat stress prevails in Central Florida gardens due to sun, wind, quick-drying sandy soil, and humid nights that raise soil temperature.
In such a climate the most beneficial garden practice beyond mulching & watering is very likely to be misting when hot & sunny, just enough to
keep plant temperature below 90F. This enables growth under full sun when plants would otherwise miss the opportunity due to high leaf temperatures,
heat stress, and soil moisture loss. We found misting highly beneficial for persimmons, loquats, blueberries and avocados where flushes of new leaf
growth would have been severely burned back by the heat of the sun without misting.
It seems most beneficial to regularly mist the fruit tree canopy and mulch, during hot sun, in order to maintain an optimum soil moisture
profile, such that deep soil is moist enough for deep root growth, topsoil is moist enough for plant uptake of nutrients, and mulch is moist enough
for rapid mulch decomposition. Such a moisture profile also encourages pioneer weeds to grow in the mulch, for chop and drop harvesting, reducing
the needed volume of compost/mulch, and providing options in nutrient sourcing. We do not yet know for sure, but we suspect that the combined
benefits of misting outweighs the costs considerably, given high moisture climates tend to be higher metabolism and thereby more productive.
We prune all branches at their collar (origin) so that the collar can close in the growth process of the parent branch to prevent decomposition/disease
entry. The profile of the parent branch after pruning a child branch appears as if the child branch was never there. In other words, no stub is left,
because stubs cannot close to protect the inside from decomposition/disease entry. Heavy duty wire cutters work better than saws/knives to prune small
branches in tight places for best control, to prevent injury/damage to nearby bark. With any tool, the bark should be cut through all around the
circumference before disconnecting the branch to prevent tearing the bark.
The amount of soil moisture conserved by misting likely rivals the amount of mist water consumed. Conserving soil moisture, especially with compost
application, enhances nutrient availability to plant roots. Mist evaporated from plants by dusk averts pathogens. Allowing topsoil to dry periodically
also averts pathogens and, along with deep watering, encourages deep rooting.
Plants vulnerable to pathogens thriving in above-ground moisture/humidity need drying periods between mistings. If these plants are also vulnerable
dry soil then it becomes important to water the soil without wetting the plants alternately with the misting. Such careful attention is probably
crucial for plants that thrive in clay soil to also thrive in sandy soil.
Different pests attack different plants in different places at different times. Let's review what helped others with similar pest problems in their
Our spray-on contact pesticide for ants, whiteflies, mealybugs, spidermites and scale is 1 qt water to 1 tsp soap & 1 tsp oil. We use castile
liquid soap from soapmakers' supply which lacks additives and we use cold-pressed olive oil. The oil makes the soap stick better and the soap
destroys the pests. We think it will also destroy larvae/eggs. We add 1 tsp baking soda to kill fungal spores. Since this also destroys beneficials,
we only spray where the pest population has exploded to cause serious damage.
We've found covering young papaya fruit with spanish moss immediately after flowering until growth to a diameter of 3" is effective in preventing
papaya fruit fly (papaya wasp) stings.
We're wrapping the stems of tomato, pepper & other transplants with cardboard from ground level up a couple of inches to prevent girldling by
unknown pests (problably slugs).
Drought Stress Signs
Not all plant species tell you clearly when they need water. Some species will exhibit no changes for weeks as the deep soil gradually dries out,
and then, suddenly, they experience catastrophic damage. These species include citrus, mango, persimmon, fig, grape, pawpaw, sugar apple, and mulberry.
Young leaves/stems may wilt but mature ones do not. So we have to check soil moisture directly at the various depths.
In harvesting weed plants for composting, for many plant species, harvesting everything above-ground kills the plant so the roots compost in-place,
building the soil. If the plant is weakened, rather than killed, it can grow pathogen populations, so then cutting out the root crown is best.
If the plant is perennial and isn't stealing resources, trimming it keeps it alive as an ongoing source of compost material.
Nutrients in Soil
We ask how plants thrive in nature to help us answer how to manage a forest garden. Nutrients in soil is a particularly important question. We read that
plants need nitrogen, potassium and phosphorus in larger amounts, and other elements in smaller amounts. How are these elements provided by nature to
plants? We read that nitrates assimilated by plants are fixed
by soil bacteria and
fungi from nitrogen in the air. We think that legumes may significantly increase the amount of nitrogen fixed in soil. It appears to us that natural
ecosystems have evolved without the high volume nitrogen production of man-made compost heaps, because the nitrogen in live plants typically escapes
into the air before soil microbes can reach it. We think potassium, phosphorus, and other elements, are made available to plants by the breakdown of
plant materials by soil microbes and other biota.
Composting - Cornell Waste Management Institute
Composting | NC State Extension
Composting and Mulching | UGA Cooperative Extension
Winter 2017-18 in Central Florida gave us 30 or so nights below 50F, and 3 nights between 26F & 32F. Tropical fruit trees die slow deaths from
cold exposure so it wasn't until May or so until we knew the verdict. Out of 7 banana stalks, the largest two died, the next largest survived and
fruited, and the smaller ones survived with minor setback. The two that died had the least protection from the big oaks and rain trees but we suspect
their exposure due to their size figured in. Two young sapodillas died, having little protection from oaks. Covering with sheets on the freeze
nights was not enough, we think, because of the below 50F nights. We didn't measure soil temperature but we suspect removing mulch to sun the soil
might have helped. We know the three freeze nights minus the below 50F nights would not have killed them because we've had such freeze nighte before.
Heat in a plant or in the ground is lost at a rate determined by its temperature and the potential for heat loss. The potential for (radiation) heat
loss to the night sky (celestial bodies) is increased as leaf, tree, and cloud cover, and humidity are reduced. This mechanism can dominate when wind
is calm. The potential for (convection) heat loss to the air is increased with wind speed and with the absence of barriers such as trees, hedges
and mulch. This mechanism can dominate when there is significant wind. Conventional discussions tend to neglect (radiation) heat loss to the night sky,
so outcomes may be surprising. We have witnessed abundant evidence of its contribution in different outcomes as leaf, tree, and cloud covers vary with
planting positions and weather conditions.
Don't try to compost dying leaves, e.g. on a banana plant. In general, we think, if you leave the leaves on the plant as they die, the plant recovers
nutrients from the dying leaves. Probably the same is true of flowers.
We have been growing most of our garden vegetables in guilds with the fruit trees. Some of these guilds out-perform others, and there doesn't
seem to be any rhyme or reason to it. We seem to notice blacker, richer soil in some of the better guilds but we don't understand the cause of that
soil appearing in some places and not others. We find some guilds are productive with less black, rich soil. One season, a single Black Krim tomato plant
produced in guild with our Cara Cara orange, more than what ten plants typically produce elsewhere, but subsequent seasons that guild was only average
in performance. For our own use, we list here our Tanenashi persimmon, Sugar Cane jujube, Sugar Apple #1, Cherry of the Rio Grande, and Po Pyu Kalay Mango
as consistently better-performing guilds.
Planting Seed Pies
Aluminum pie pans seem to work well for starting tomato, pepper seeds, also eggplant and ground cherry. These need transplanting because
field-sown they are highly vulnerable to cutworms. We max 1/3 compost and 2/3 native sandy loam from under the oak trees in our seed pies. This soil
compacts with water so we fill the pie pan to the top, water it well, and add more soil after the watering compacts it. After the soil dries sufficiently
then we plant the seeds. We're careful not to water too much since these containers don't drain. The plants seem not to be bothered by our breaking apart
their rootballs for planting. We do have to protect the seed pies from coons who like to dig in any fresh soil.
In our garden here in central Florida zone 9a/9b, Capsicum chinense pepper plants thrive 3+ years producing hundreds of fruits while Capsicum
annuum plants barely produce 2 fruits before dying. We think this is because Capsicum chinense is much better adapted to our climate, particularly
the humidity. So we think the following basic data may be a valuable guide in choosing pepper varieties:
Capsicum annuum is especially productive in warm and dry climates. Capsicum baccatum is the domesticated pepper of choice of Bolivia, Ecuador,
Peru and Chile (highlands). Capsicum chinense is native to Central America, the Yucatan region, and the Caribbean islands. We've experienced
a challenge with wildly variable heat among hot pepper fruit, even among fruits on the same plant, with a huge impact on dish prep.
Planting Bare Root Trees
Bare root is a way to ship deciduous trees that minimizes shipping costs because they can survive without soil when dormant. After we
receive shipment of bare root trees we unpack them immediately, keep their roots moist, and keep them in shade with fresh air and a temperature
between 40F and 80F. We plant them in the soil with the highest root immediately below the soil line and no deeper. This is extremely important
because we found that in general the highest root is the only reliable indicator of the root crown. If the tree is planted deeper, the stalk/trunk
above the root crown can be fatally attacked by fungus. Two of our bare root trees were killed by such fungus as a result of our mis-identifying
the root crowns and planting too deep.
Mango Embryo: Mono vs Poly
Indian mango varieties are mostly monoembryonic while Indochinese mango varieties are mostly polyembryonic. In the case of mangos, monoembryonic means
the seed contains one embryo that is not a clone of the mother plant, and polyembryonic means the seed may contain multiple embryos, all except one
being clones of the mother plant. Not well-documented is the fact that some polyembryonic varietes, in particular the small yellow fruits commonly
sold in US groceries, produce mostly monoembryonic seeds. So if one seeks to grow clones of the mother plant, one must cut open the woody seed hull
of several or even many grocery fruits to find one that is polyembryonic. Here is an image comparing mono & poly mango embryos. The poly embryo has
multiple attached parts.
Heirloom and Compost
Heirloom varieties of garden plants were selected in compost gardens so these are most likely to thrive in compost. We see how positive things
tend to be connected.
How to Remove a Tree
We have a lot of tall skinny trees that need removing to increase sunlight for our food forest. We need to control a tree's direction of
fall to prevent it hitting the house. We saw the tree in the direction we want it to fall to the point just before the remaining wood becomes
too weak to hold the tree up. We then tie a rope to the tree as high up as we can get with our 8 ft ladder. We then pull on the rope to bring
the tree down.
How to Climb a Tree
If you have tall, skinny trees that need pruning, and the lowest branch is out of reach, you can make a climber out of rope.
Get 16 feet of natural fiber rope strong enough to support your weight, cut it in half, and make two identical climbers like so: make
a 2 inch diameter loop, using a loop knot, at one end, the diameter being large enough so other knots in the rope easily pass through.
Next, make a 10 inch diameter double circle loop 3 feet from the 2 inch loop end, using a loop knot. Tie the double circle together using string.
This is the foot loop, and is large enough for most size boots to fit through. The double circle is for comfort. The 3 foot length between
these loops will go around up to 1 foot diameter trees. Adjust these parameters according to your needs. Next, cut off any remaining rope.
Loop one of the climbers around the base of a tree, and put the foot loop, knot and all, through the 2 inch loop, step into the foot
loop and support your weight on it. Now do it again 2 feet up on the tree with the second climber, and your other foot. If the tree is
smooth enough, you can raise a climber without removing your foot from it, while standing in the other climber. Don't forget to attach your
pruning saw to yourself in some way. Note that natural fiber has the best grip but also the least strength. Take your time, and be safe.
We've had great luck with our pruning saw cutting tree trunks/branches. The saw blade is curved with cross-cut teeth.
Curved pruning blades allow for less lateral force for the same amount of cutting, and cross-cut teeth are symmetric in shape so that
it cuts in both directions of the blade movement. The blade cost us $2 and we attached it to a board 0.5" x 1.25" x 4' by cutting a slot in
one end and securing the blade with two bolts/nuts. After a couple of years of great service, the blade began to jam in the wood as the depth
of the cut grew more than 0.5" or so, due to the blade losing its set. Blade set is the protrusion of the teeth sideways, in alternation,
to cut a slot that is wider then the blade to prevent jamming. To set the blade, we hold it with heavy-duty needle-nose piers, and clench a
small pair of vise-grips on each tooth, bending it out about 1/32 inch. Sharpening is done with a small triangle file. After setting/sharpening,
it cut easily through a 7 inch camphor tree trunk in 2 minutes of sawing. Sharpness of tooth point is vital because if it rolls over the wood
then it doesn't matter how sharp is the rest of the edge.
Most of our banana plants are Dwarf Cavendish, leaf tips reaching 10 ft, in our climate
. We allow one plant to fruit
at a time per root mat, removing pups accordingly. Our main challenge is choosing which pup to be the next adult in the root mat, given
the challenges of growing this tropical species in our subtropical environment.
One problem is that a plant flowering in late fall is slow to mature its fruit due to the cold killing most of its leaves. A plant that
is not flowering in fall can grow more leaves in spring before it flowers, but a plant that has alreadly flowered depends on existing leaves to carry
the fruit through maturity.
We think pups around 1 to 3 feet to leaf tip at start of spring are candidates for removal (because these are most likely to flower in late
fall the next year) so that pups of other sizes may be able to fruit before winter, or during winter with enough leaves. If the adult in a root mat
is killed by a freeze, it's the same scenario because this will shift the next pup's schedule up a full year, causing a 1 to 3 foot pup to flower
in fall of the current year instead of the next year. Such schedules will of course vary with the usual factors, such as shade, soil, weather, etc.
Another problem is that enduring a cold winter (or other adverse condition such as inadequate nutrients) will stunt rather than slow growth
resulting in a smaller yield of fruit on the same schedule. We think smaller/younger plants are not affected by cold as much as larger/older plants.
We think pups emerging in spring would enter next winter at 3 to 6 feet high and be adversely affected so it's best to remove these and keep only pups
emerging in fall so that they will enter winter below 3 feet. Plants entering winter at full size will produce a full yield after flowering in either
winter or spring, so long as they are not killed by winter freeze.
Plant Feeding Cycle
Plant a tree and each year's crop is the size of its nutritional input, which is its own dropped leaves/roots from the previous year.
Add a companion plant and prune/turn under 1/3 of its foliage each year and a portion of its lost foliage/roots suppliment the size of the tree crop.
2005, 2006, 2007
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