From variety selection to hand pollination and harvest, here is what actually works for kalabasa growers, from Pangasinan's "Kalabasa Capital" to a backyard plot, updated with current varieties, prices, and a straight answer to the question every grower eventually asks about the shifting planting calendar.
Squash, locally known as kalabasa, has a reputation as one of the more forgiving vegetable crops a Filipino farmer can plant. It is not wrong. Compared to leafy greens or onion, squash tolerates a wider range of soils, does not demand cold storage, and a mature fruit can sit for weeks without spoiling, which takes a lot of the timing pressure off the harvest decision. None of that means it runs on autopilot, though. Two viral diseases, a pollination step that confuses a lot of first-time growers, and a planting calendar that is getting less predictable every year are the parts that actually separate a good kalabasa harvest from a disappointing one.
This guide was first published in 2012. It has been rewritten for 2026 with updated varieties, current price data, and direct answers to two of the most common questions readers have asked on this very page over the years: how to hand-pollinate when the male and female flowers are far apart, and whether the planting calendar still holds up against a shifting climate.
Variety selection, site and climate requirements, the planting calendar, land preparation, crop establishment, fertilizer and irrigation, hand pollination, vine training, pest and disease management, harvest, a 1-hectare budget, and the common mistakes that cost growers yield. Jump to any section using the table of contents below.
1Why Grow Squash: Market Snapshot for 2026
The Department of Agriculture lists squash among the country's high-value crops specifically because of its high-yielding nature, and farmers tend to favor it over more delicate vegetables for a simple reason: it is low maintenance relative to its returns. A 2026 marketing study in Cabuyao City found farmgate prices averaging around ₱26.20 per kilo, with selling prices climbing through each layer of the supply chain, from assembler-wholesalers to retailers, before reaching the consumer. Nationally, retail prices for kalabasa have been holding in the ₱40 to ₱80 per kilo range as of April 2026, according to Department of Agriculture monitoring, a touch firmer than the ₱30 to ₱90 range seen earlier in the year.
Squash also has a built-in advantage that crops like onion and leafy greens do not: a mature fruit's shelf life is long enough that growers are rarely forced into a fire sale at harvest. That said, it is genuinely not perishable, not invincible. Fruit quality still drops if you mishandle irrigation near maturity or harvest at the wrong stage, both covered below.
2Where Kalabasa Is Grown
| Region / Area | Scale | Notes |
|---|---|---|
| Ilocos Region, Cagayan Valley, Southern Tagalog (CALABARZON), Bicol | Full commercial | The four established commercial production belts for squash nationally. |
| Davao, Leyte, Nueva Ecija, Batangas | Semi-commercial | Significant but smaller-scale production areas. |
| Umingan, Pangasinan | Regional hub | Locally dubbed the "Kalabasa Capital" of Pangasinan, with roughly a hundred hectares devoted to the crop. Farmers there also sell the squash's male flowers as a separate vegetable, a bundle of 10 fetching around ₱8. |
| Benguet and other highland areas | Cooler-climate supply | Supplies fresh kalabasa to lowland markets year-round, taking advantage of cooler growing conditions. |
3Choosing Your Variety
The traditional open-pollinated strains recommended for commercial planting in the original PhilRice guidance still hold up well, but the hybrid options on the market have moved on, especially on disease resistance.
| Variety | Type | Days to Maturity | Yield (t/ha) | Notes |
|---|---|---|---|---|
| San Leonardo | Open-pollinated | 90 | 25–35 | Moderately flat fruit, fine-grain glutinous orange flesh. Tolerant of insect pests and squash mosaic virus. |
| Nueva Vizcaya strain | Open-pollinated | 90 | 25–35 | Same fruit profile as San Leonardo. Suited to both dry and wet season planting. |
| Suprema F1 (East-West Seed) | Hybrid | ~85 | Commercially strong | The long-standing industry standard, bred in the Philippines roughly 35 years ago. Attractive orange flat-round fruit, resistant to virus and powdery mildew, wide climate adaptability, excellent eating and shipping quality. |
| Bella F1 (East-West Seed) | Hybrid | ~85, similar to Suprema | Comparable to Suprema | An improved successor to Suprema with added resistance to Squash Leaf Curl Virus (SLCV), the disease that has caused the heaviest losses in recent plantings. Round, flat, shiny green-skinned fruit, 3 to 5 kg each, thick semi-glutinous yellow-orange flesh. |
| Other NSIC-registered open-pollinated varieties | Open-pollinated | Varies | Varies | Lower seed cost, a reasonable fit for backyard and small-scale growers. Check the National Seed Industry Council's online registry (nsic.buplant.da.gov.ph) for the current list of registered squash varieties available in your region. |
Hybrid F1 seed costs more upfront but tends to deliver more uniform fruit, stronger disease resistance, and better shipping quality, which matters if you are selling to wholesalers or supermarkets. Open-pollinated varieties cost less per planting and let you save seed for the next cycle, which suits backyard growers or anyone testing the crop on a small plot before scaling up.
4Site Selection and Climate Requirements
Choose a well-drained area of at least 1,000 square meters, ideally land that was previously planted to rice and has reliable access to a water source. Squash tolerates most well-drained soil types, but it performs best on sandy loam or clay loam with a pH between 6.0 and 6.7.
5Planting Calendar (and the Climate Shift Question)
The traditional recommendation is to plant in rice-based lowland areas from October to December, and in hilly areas from May to July. Both windows are timed to avoid the peak population of insect pests and the highest incidence of plant disease, and they remain a reasonable starting point in 2026.
That said, this is genuinely worth a second look before every planting now. PAGASA's own climate monitoring shows clear warming trends and increasingly erratic monsoon timing nationwide. Rainfall has been trending upward across most of Luzon and the Visayas, while trending downward across most of Mindanao and western Luzon, which means the same calendar month can mean different things depending on where your farm sits. The onset of the rainy season itself has also become less predictable: in 2026, PAGASA declared the rainy season's start on June 4, well into what some growers would consider late, and did so even as forecasters were already flagging a strong El Niño pattern that could undercut the monsoon rains the declaration assumes.
Treat October to December and May to July as starting guidelines, not fixed dates. Before each planting, check PAGASA's monthly Agro-Climatic Review and Outlook (available on the PAGASA website) for your specific region, and talk to your Municipal Agriculture Office about how local rainfall has been tracking that season. Favoring early-maturing hybrid varieties also gives you a buffer if the dry or wet spell arrives earlier or later than expected.
6Land Preparation
| Method | How it works |
|---|---|
| Zero tillage | After the rice harvest, dig planting holes with a grub hoe or pick mattock, spaced 2 meters apart. Minimal soil disturbance, faster turnaround between crops. |
| Complete land preparation | For lowland rice-based areas: pulverize and level the soil, plow and harrow twice alternately at the right soil moisture (not too wet, not too dry). Form shallow furrows 2 meters apart with hills spaced 1 meter apart along each furrow. Incorporate organic fertilizer and complete fertilizer thoroughly into the soil at planting. |
7Crop Establishment: Direct Seeding vs. Transplanting
Direct seeding
- Plant 2 to 3 seeds per hill, spaced 0.5 meters apart, on mounds during the wet season or in furrows during the dry season.
- Space rows 5 to 7 meters apart, since squash vines need considerable room to run.
- At 3 to 4 weeks after planting, remove weak or diseased seedlings, leaving one healthy plant per hill.
Transplanting
For hybrid squash, where seed cost is higher or seed quantity is limited, raise seedlings first instead of direct seeding.
- Sow one seed per hole in a nursery tray filled with a mix of 2 parts garden soil, 1 part burned rice hull, and 1 part compost.
- Transplant 2 weeks after seedling emergence.
- Irrigate immediately after transplanting and mulch with rice straw.
- Begin arranging the growing vines as they extend.
8Fertilizer Program
For lowland rice-based areas, incorporate organic fertilizer and complete fertilizer at harrowing, before planting. For hilly areas using the hole method, apply about 100 grams of organic fertilizer mixed with 1 tablespoon of complete fertilizer in each hole.
| Fertilizer | Rate per Hectare | Timing | Method |
|---|---|---|---|
| 14-14-14 (complete) | 2–3 bags | At planting | Basal |
| 46-0-0 (urea) + 0-0-60 (muriate of potash), 1:1 mix | 3 bags + 3 bags | 14 days after planting | Side-dress |
| 46-0-0 + 0-0-60, 1:1 mix | 3 bags + 3 bags | 28 days after planting | Side-dress |
| 46-0-0 + 0-0-60, 1:1 mix | 3 bags + 3 bags | 42 days after planting | Side-dress |
| 46-0-0 + 0-0-60, 1:1 mix | 3 bags + 3 bags | 56 days after planting | Side-dress |
Follow the rate and timing closely. Under-fertilizing produces weak vines and small fruit, but consistent, correctly timed side-dressing is what actually drives vigorous vines and bigger fruit, not simply applying more at once.
9Irrigation
Irrigate regularly, providing roughly 1 liter per hill, with watering every other day during the critical periods: planting time, early vegetative growth, flowering, and fruit development. Irrigate again after every fertilizer application to help the plant take up nutrients. Stop irrigating once fruits have reached the mature green stage, since continued watering at that point lowers fruit quality.
10Hand Pollination: Getting Fruit Set Right
Bees and other flying insects are squash's primary pollinators, but in a large monocrop field, or simply on a day when pollinator activity is low, natural pollination often is not enough to set a full fruit load. This is also the single most common question growers ask about this crop, including readers of this very guide: what do you do when the male and female flower you want to cross are not next to each other?
The fix is simpler than it sounds
You are not relying on an insect to fly between two distant flowers. You are doing that job yourself, by hand, which means distance is not actually a constraint.
- Pick a freshly opened male flower. You can tell it apart from a female flower because it has a thin, plain stem with no swollen fruit behind the petals.
- Strip away the petals to expose the pollen-covered anther in the center.
- Carry it over to an open female flower, identifiable by the small swollen fruit already visible behind its petals, and gently dab or rub the pollen directly onto the stigma at the flower's center.
- Do this between 6:00 and 8:00 in the morning. Squash flowers open for only one day, and pollen viability drops quickly as the morning warms up, so later attempts are far less effective.
If your goal is seed production rather than fruit for market, rub pollen into the pistil of female flowers every morning from early flowering through peak flowering to maximize seed yield.
Squash is highly cross-pollinated, and crossing between cultivars of the same species, and even between some species, happens easily if you are not careful. If you intend to save seed true to type, maintain an isolation distance of at least 500 meters from other squash plantings for certified seed, and 1,200 meters for basic seed production.
11Vine Training and Weed Control
Weeding
- Remove weeds while plants are still small, using light hoe weeding as soon as weeds appear.
- Off-bar and hill up the plants, taking care not to damage the roots.
- Once the field is fully covered with vines, switch to manual spot weeding only, since the vine canopy itself will suppress most further weed growth.
Vine training
Train the vines along the rows starting around 25 days after planting, re-orienting them weekly so they spread evenly across the plot. This makes irrigation, weeding, spraying, and hand pollination far easier to carry out across the whole field. Once a vine has already set fruit, leave it alone. Repositioning a fruiting vine is one of the easiest ways to knock off developing fruit and reduce your yield for no good reason.
12Pest and Disease Management
Insect pests
| Pest | Damage | Suggested Management |
|---|---|---|
| Squash beetle | Yellowish beetles scrape the leaf surface, leaving a skeletonized appearance. Infestation at the cotyledon stage can kill seedlings outright. | Sweep beetles off by hand with an insect net while populations are still small. |
| Aphids (Aphis gossypii) | Tiny insects that colonize the underside of leaves and reproduce without mating, multiplying fast. Their sticky excretions promote sooty mold, which blocks photosynthesis, and they secrete substances that curl leaves and stunt shoots. | Crush visible colonies, then spray both infected and healthy plants with basil leaf extract at about 200 ml per 16 liters of water. |
| Leafhoppers (Empoasca sp.) | Suck plant sap, causing "hopper burn" and leaf drying under severe infestation. Reduced yield, but tolerable with adequate irrigation. | Overhead irrigation twice a week reduces populations; weekly flooding helps replenish sap lost to feeding. |
| Whitefly (Bemisia tabaci) | Small white flies on the leaf underside that transmit viral diseases, including Squash Leaf Curl Virus, causing abnormal leaf and shoot growth. | Overhead irrigation twice a week and yellow sticky traps both reduce populations; weekly flooding also helps. |
Diseases
| Disease | Signs | Management |
|---|---|---|
| Mosaic virus | Mosaic or yellow-green leaf pattern with slight curling. Spread by insect vectors or through seed. | Uproot and burn plants showing early symptoms. If infection appears at fruiting stage, the plant can usually tolerate it with weekly irrigation through harvest. Never save seed from infected plants. Uproot and burn all infected plants after harvest. |
| Leaf curl virus (SLCV) | Seed-borne and insect-vectored (whitefly). Curling leaves and shoots, shortened internodes, dwarfed appearance. Plants survive and leaf out but fail to produce normal shoots or fruit. | Same as mosaic virus: rogue and burn infected plants, never replant their seed. Whitefly control is the most effective preventive step. Planting an SLCV-resistant hybrid such as Bella F1 is the strongest long-term defense available. |
Alternate insecticide classes (carbamate, pyrethroid, organophosphate, and similar groups) when spraying repeatedly for the same pest, to slow resistance buildup, and stop spraying at least 2 weeks before harvest. Always check the Fertilizer and Pesticide Authority's current list of registered products before buying, since specific brand-name registrations change from year to year, and your Municipal Agriculture Office can confirm what is currently approved and available in your area.
13Harvesting and Post-Harvest
For fresh market sale, harvest just before fruits are fully ripe, or once the peduncle (the stem connecting fruit to vine) starts to dry. Harvesting with a portion of the peduncle still attached extends storage life noticeably, so do not trim it flush against the fruit.
For seed production, harvest immature fruit at 30 to 40 days from pollination. A powdery whitish bloom on the fruit surface and a hardened rind both signal that the seeds inside are mature and fully developed. For fresh market fruit, harvest once the rind turns brownish orange. If you are harvesting for seed, only take fruit from plants showing no symptoms of mosaic or leaf curl virus, to avoid carrying infected seed into your next planting.
Unlike onion or leafy greens, a properly cured squash fruit can be held for weeks without specialized cold storage, which gives you real flexibility to wait for a better price instead of selling everything the day you harvest. That advantage only holds if the fruit was harvested at the right maturity stage and with the peduncle intact, so do not skip that step to save a few minutes at harvest.
14Budget and Income: 1 Hectare
The figures below are planning estimates based on the fertilizer program above and recent farmgate price data. Confirm current input prices with your local supplier before finalizing a budget, since fertilizer and seed costs shift throughout the year.
| Item | Estimated Cost (1 ha) |
|---|---|
| Land preparation | ₱8,000 – ₱15,000 |
| Seeds (open-pollinated) or hybrid F1 seed | ₱3,000 – ₱25,000 |
| Fertilizer (basal + 4 side-dress applications) | ₱35,000 – ₱55,000 |
| Pest and disease control | ₱10,000 – ₱20,000 |
| Labor (vine training, hand pollination, weeding, harvest) | ₱40,000 – ₱60,000 |
| Irrigation | ₱5,000 – ₱10,000 |
| Estimated Total Production Cost | ₱100,000 – ₱185,000 |
| Scenario | Yield × Farmgate Price | Gross Income | Rough Net (after ₱140,000 cost) |
|---|---|---|---|
| Conservative (open-pollinated, lower-end yield) | 10,000 kg × ₱20/kg | ₱200,000 | ~₱60,000 |
| Strong harvest (hybrid, well-managed) | 18,000 kg × ₱30/kg | ₱540,000 | ~₱400,000 |
The gap between these two scenarios comes down almost entirely to variety choice, fertilizer discipline, and consistent hand pollination, all of which a grower directly controls, unlike a crop such as onion where the harvest-season price swing is largely out of any single farmer's hands.
15Mistakes That Cost Squash Growers Yield
Skipping hand pollination in a large or isolated field
If natural pollinators cannot reliably reach every flower, especially in a monocrop planting far from other flowering vegetation, fruit set drops noticeably. Hand pollination closes that gap regardless of how the field is laid out.
Hand-pollinating too late in the day
Flowers open for one day only, and pollen viability falls quickly as the morning warms. Pollinating after 8:00 a.m. is far less effective than doing it at first opening.
Continuing to irrigate after fruits reach the mature green stage
This is one of the fastest ways to lower fruit quality right before harvest. Stop on schedule even if the vines still look like they could use water.
Replanting seed from a virus-infected crop
Both mosaic virus and leaf curl virus can be seed-borne. Saving seed from symptomatic plants reintroduces the disease into your next planting cycle.
Repositioning vines that have already set fruit
Vine training should happen early and consistently, but once a vine has set fruit, disturbing it risks knocking the fruit off entirely.
Ignoring whitefly populations while they are still small
Whitefly is the main vector for leaf curl virus. A small, early infestation left unmanaged tends to become a field-wide virus problem within weeks.
Planting strictly by the old calendar without checking the current season
Monsoon onset and rainfall patterns have become noticeably less predictable in recent years. A quick check of PAGASA's seasonal outlook before planting costs nothing and can save an entire crop cycle.
2 Comments
Ano na ngayon ang bagong season sa pagtanim ng kalabasa? Kasi may shift na ng climate..
Pasensya na po bago lang po sa larangan ng pagsasaka.