Why is My Squash Turning Yellow?

spaghetti squash 73118 - 1So many people come to me with questions about their gardens. I think one of the cutest things they tell me, is that they keep getting blossom end rot on their summer squash. You know, where, you get all excited because it is your first squash of the season. Every day you check on it with anticipation. Then, the horror of horrors, it starts turning yellow! Aaaahh! You babied it, watered it, fertilized it. Now, this.

More than likely, it wasn’t pollinated. Wind and bees are the primary ways pollination gets done. Mommy flower and Daddy flower get together, and well, you know how it works.

Squash, melons, pumpkins, and cucumbers are members of the same family and they often have problems with pollination due to the male flowers falling off before the female flowers open. 

Here is a great article I read this morning that tells you, in simple terms, how to get around that. Easy peasy and soon you will be giving squash away, right and left!

Here is the link and I’ve included the article to. Thank you to Harvest to Table for the great read.

https://harvesttotable.com/hand-pollination-of-vegetables

hand pollination

Hand pollination is the manual transfer of pollen from the stamen of one plant to the pistil of another–that is from a male flower to a female flower.

Members of the Cucurbit family–squash, melons, pumpkins, and cucumbers–often have pollination problems because the male flowers commonly open days before the female flowers and so often drop before pollinators such as bees can transfer pollen from male to female flowers.

When female flowers are not pollinated, the fruit will never appear. The nascent fruits–bulging embryos–at the stem end of female flowers will shrivel and die if not pollinated.

If fruit is not forming on your Cucurbit family plants, you can help. Rub a small brush or cotton swab on the stamen of a male flower (it will be dusty with pollen) then rub the brush on the stigma of the female flower.

Hand pollination

Alternatively, you can remove the petals from a male flower and brush the stamen against the stigma of a female flower.

Which flower is male and which is female? Female flowers have a small bulge (a small immature flower) where the stem meets the flower. Male flowers are shorter than female flowers and often appear in clusters.

1 thought on “Why is My Squash Turning Yellow?

  1. My zucchini had the opposite ‘problem’ when they started out. Fruit seemed to appear with the very first flowers, before male flowers developed! I would not have noticed except that there were only about three flowers, and they made three fruits! I know that there were male flowers in there somewhere, but I could not see them.

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